Reducing pixel dimensions increases document size.

In photoshop cs6. Working on an image of 15000x18662 pixels, with about 100+ layers.  doc size 800mb/6.43GB.  To optimize speed, I reduced the file size to the absolute minimum I need which is 13200x16423.  However now the file size grew bigger  620.2M/6.45GB.   Some layers extend beyond the visible image area, so I cropped the image "deleting cropped pixels" , but this increased the image even further to 6.50GB.  What's going on here? 
Why is the file size increasing when I decrease pixel size?
Why would deleting cropped pixels increase file size?

This is a user to user Forum.
If no one who has bothered to read the original post considers it of enough interest to investigate or advise that is up to them.
Can you provide the original image?
Depending on the interpolation settings on the content downsampling might result in a lessened effect of the applied compression.
You seem to give the approximated values from "Document Sizes" in the status bar – what is the actual file’s size?
Quote from the Reference:
Document Sizes Displays information on the amount of data in the image. The number on the left represents the printing size of the image
—approximately the size of the saved, flattened file in Adobe Photoshop format. The number on the right indicates the file’s approximate
size including layers and channels.

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