Know that the most important thing is a flat base plate, if the stock lies flat on the baseplate as it passes the bit you're golden.
2nd, fact of gravity, all things eventually sag under their own weight.
Not knowing what the platform is for your RT top and how it is configured, if you haven't already set the top up on the whatever, you might consider convex up. If so, you can use a counter weight on top to level it out and a series of L brackets to hold it down.
Eventually over a series of months or years you'll be able to remove the brackets if thats still a factor.
Never bite the hand that looks dirty!
The more you know the more you're worth