File size and quality of images from iphone to mac to exported jpeg

there is a lot of  good info on this forum regarding jpeg compression, iphoto export etc but i want to confirm a couple things..
i have 'my photo stream' enabled so that i can upload my iphone photos to my mac and my plan is to use iphoto (im just starting to do this)...
yes, i understand that the 'image' taken by iphone is stored as 'data' and some of that data (and potentially pic detail/quality)  can be  lost/reduced/discarded when you ask an application to export a .jpeg with a high, med, low compression applied. 
am i correct that this 'my photo stream' process is not removing any image data?
e.g.  i can export a 'full size' jpeg from the iphone and i see a 3.2MB file. if i look at that photo in Iphoto and export original.. i get a 3.2MB file. i assume that the original image was only compressed once?.. when it was originally stored on my camera roll in the iphone?
If i just want to use iphoto to add tags, description... i am required to recompress the image into a file and my choice of MAX compression yields 10MB (which is more space but no more detail vs HIGH compression which yields a 1.9MB file (which most likely is less image detail).  there is no way to get the same original 3.2MB amount of data but with the appropriate text fields added into the new jpg file ?   would it be much better, at least in theory, if i could get the goldilocks file size, ie just enough compression to have a similar file size as the original ... seems like my choice is 50% less or 300% more ?!?

am i correct that this 'my photo stream' process is not removing any image data?
Yes,  as long as you have iPhoto's iCloud preference pane configures as follows:
You're be getting the full image file, pixel dimensions, etc. which is essentially a bit by bit copy of the photo on the Phone.
When you add tags and other metadata and export the file out of iPhoto as a jpeg with the checkboxes selected to include that metadata there will be some image compression.  However, if one chooses High or even Medium JPEG Quality one will be hard pressed to detect any image degradation unless printing very, large prints or otherwise displaying the image at a very, large size.
I ran a test on a 1.4 MB photo from my iPhone  and compared the original to two exports, one at High and the other at Medium JPEG Quality and got these results:

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