honestly, here it is. u have spec SCT and pro SCT. spec, as it is, as they are. slight tweaks to rules will come as they see fit. however in the spec class the object should be bout the driver gettin faster and having a place to compete have fun and not feel like their gettin in the way. so it honestly shouldnt matter very much if ur brand of truck has 'worse' tires according to us neo-pros.
you can enforce "bump ups" to pro based on wins, qualifying time % to pro class TQ, gap to 2nd qualifier etc.
pro is self explanatory... only choice is to make it 'open' or keep it 'spec'. honestly i dont think ur brushless system is gonna help you beat a well honed driver in spec trim at bumps and jumps.
if the goal is to make these trucks simple and inexpensive, and a fun time. honestly stay closer to stock. i cant answer the question on tire rules, have to figure that out in time.
R