Custom rack, isolation under platform vs component?

Nicely done but heavy duty is key  to keep from having any movement. I've built two and outgrew them both,  one is torn apart and I have some nice maple back on my  lumber rack and the other one I gave away.
I have some 8/4 quartersawn red oak  drying as we speak for a six tier single width rack and am working on a plan. Adjustable shelves would be nice but not sure how to implement.

Yes, thank you. I am thinking that I will bolt the platforms in to hopefully increase rigidity. I assume that would be most beneficial even if others say they prefer the feet under platform vs component. In my case the rigidity should probably be addressed first. 

Components.

Nice job on the rack.

Do you have concrete or a wood floor?

Isolation aside, a neat & tidy job. Well done. If your cross pieces were actually fully fastened solid panels, with the maple shelves on those, all your structural issues would go away. Lot more work, obviously, but it looks like you have the skill needed.

Great job on your rack- that looks really nice! Not sure how much “wiggle” you’re experiencing- perhaps using a larger dimension material for the horizontal bracing (similar to your vertical supports) would help provide more rigidity/stiffness. The shelves for the components look substantial and have a nice finish. Well done!