Still not entirely sure if I should use LDRXN to cap the load or LDRXN and KFTARX or KFLDHBN.
Two methods to accomplish what you want. Up to you depending on your goals.
Also as there are a lot of variables that make up rlmax, how do people usually use to adjust rlmax?
Generally, trial and error
IE
If rlmax is to be incresed by 5% what amount would you increse LDRXN asumming all the other variables stay constant?
More or less for small changes.
You're on the right track now.