Precomp "losing" quality on the parent comp

Hello,
i've noticed an oddity after placing a couple layers in a precomp in that it looks "blurred" and has "jagged" edges on the main comp, but if i open the precomp it looks ok, the same problem happens after i render the output.
The precomped layer is simply two non-transparent 24 bpp PNGs (some rendered text on a black background) that have some transforms applied to the position and rotation, no other effect is present.
When i see it in the main comp one of the blocks shows white jaggies around it (the transform drops one of the blocks and rotates it like a falling billboard), and if i compare the comp windows to the precomp, it's clearly blurred.
i've googled and saw something about collapse transformations, i set it in the main comp for the precomped layer to no avail.
i also tried with color-keying the black BG in the precomp, the result is that in the main comp the image expanded to the left and had some ugly artifacts inside the letters.
these are cropped parts of the workarea, first the comp view with the distortion jaggedness and after that the precomp window(it's hard to see you might need to zoom in):, even then it's clear that the comp is blurred
i've turned off all preview tricks, working at full resolution, no avail...
i used this same precomp on another project (from which i imported it) which uses the same resolution and framerate and i wasn't seeing that issue there

i've checked both layers in the precomp and they're set to high quality, same as the precomp aulity in the comp itself, also disabled opengl completely in preferences and the jaggedness remains.
About the PAR of the png files, haven't checked, they're a random convenient size each one(quite big, 4.18mpx~).
just animating the layer transform setiings in the precomp, here's the captures, comp and precomp:
the single frame render output of this same frame:

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Pre-comps loose Quality when putting them in parent Comps

Hi there!
I got quite a problem with my AE project and I really don't know what to do. I already Looked up the forum but didn´t find any useful help till now.
The Problem I got is that I am working on quite a big project and need to fit precomps into parent comps (most of the times through varios layers)
This time when I fit a precomp in it´s parent comp it looses quite a lot of quality. If I do this again (putting the hole thing in a new parent comp) it even looses more quality!
I checked all my compositions and all are set to full quality at 1920/1080. I am using raytraced 3D and fast draft for quick render, but when I RAM preview render my projekt with full quality it still shows big deficits and pixelation.
Here you got some screen shots, maybe they are helpful:
I hope someone can help me.
Thank you a lot in advance!
PS: Re: Precomp "losing" quality on the parent comp Already saw that post, but unfortunately it didn´t help me out/couldn´t understand what I have to do.

Hi there again.
The problems I got aren´t because of a specific Layer. The problem appears when putting one composition into another parent composition. The precomp I put inside the parent comp looses quality. The settings of both compositions are exactly the same and no draft mode ist selected. I am not zooming around or anything either. There are just 2 3D Objects on a 2D layer (and some other 2D stuff) Here I put now complete screeneshots:
The pic. above is my precomp. Quality and everything is fine and it looks like it should. Cool. Now when I take this composition and just put it into another composition with exactly the same settings, it should look exatly the same way (no zoom or anything , just drag and drop into another comp):
As you can see the quality is a lot worse then it should be (the sphere the iPhone etc.). I didnt change a layer or set a keyframe or zoom or anything and the parent comp has the same settings as the precomp. So it should show exactly the same. But for some reason it doesnt.
Now what I found out is that in the advanced comp settings I can put "preserve comp quality when nesting" so I do that. If I put now the composition into it´s parent comp then this happens:
Ok first things first: Quality is fine, so the most important problem is solved.
But what happens doesn´t really make sense for me. Despite the fact that both comps got exactly the same quality/framerate/pixel settings, when I put the precomp into the parent comp it is shown as if the precomp would be 4 times bigger (if I take now the parent comp also with "preserve quality when nested" into another comp the same happens).
It also messes around with a weird anchorpoint position and the comp "margins" are shown only in the upper left size of the layer (as if the layer would be much smaller then it really is). I dont know why this happens, but at least I can transform my (precomp-)layer normally and fit it into the composition, so that´s fine for me.
It´s more work when animating, but at least the quality stays the same.
Maybe someone knows a better solution?
Thank you already for your answers. I hope this is specific enough...

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Precomp "losing" quality on the parent comp

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