Same issue with integrated boots here
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Just like I don't dive like you, your requirements don't apply to everyone.
There are other ways to trim out in the water besides getting heavier fins. Move the tanks a little lower, raise the wing a little higher, etc.
As I have to change my boots since they're just barely big enough, maybe I'll go the route of the socks and rock boots. If there's anyone out there who has changed boots, or boots to socks, would you send me a PM so I can discuss the procedure with you. Thanks.
If the attached boots are having that much effect, there is too much air in your suit. Air should only be added to compensate for squeeze. If the boot is 8" too long, it will be smashed flat if the suit is inflated properly during the dive, not floating full of air.