I have my machine on a torsion box with no feet. I removed all the cross straps and have just the end plates supporting the rails.
The end plates are bolted to the torsion box in the four corners with 3/4" MDF spacers and shims under them for more height and leveling.
More details here: https://timf.anansi-web.com/wp/shapeoko-3-upgrades-part-1/
I shimmed the center and front center of my xxl bed. The bed doesn’t flex now.
Ed M.
I just pulled off the bed, did some quick measurements, and superglued some stacks of washers together to take up that flex. 5/8" washers fit perfectly over the center screw holes 
put it all back together, and the noticeable flex is gone. For my current needs, this is perfect.
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