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I need help with controlling file output size.

For a recent project I've had files that are either 22 or 88 MB (u3d file size) for the exact same/nearly same 3d object. There is no noticeable difference in quality and am unable to nail down what is affecting the file size.

I really need to be able to make pdf/u3d files in the 5 to 20 MB range for emailing.

I've tried changing the resolution settings for u3d output and turning off some of the pdf toolbars and view tools before creation but with no luck. I've also moved all textures to solid colors instead of pictures (removing the texture picture link in skup before rendering).

Due to the complexity of the models some parts are 2 sided surfaces (its not worth the geometry hit to model formed sheet copper - both sides of which can be visible) so I have to export 2 sided surfaces in options can't avoid it.

Please provide a guide for what tools directly change output file size.

Also rps tool keeps telling me that I can't out put u3d files with trial even though my version is now paid for (error, cancel error, error reappears etc...) I can export u3d but still get the error if I'm browsing rps options like buttons etc.