ok, now it works as intented. guess it's very fragile if some ratios aren't fit exactly to the pixel.
what i did has been calculating the size of the iconbank for 34x34 pixels and then using the uibuilder to incrementally reduce the page's size since the the iconbank has it's target size of 139x314.
i fiddled around with setting is to resizable, but while it works very nice ingame and the windows location is stored correctly, the size is not.
attached my working 34x34 bags.
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