So, you say that having the clone minigun and rocket are what makes it doodoo, because the arfs having those already. Now, big brain time, what if you just nerf your basic trooper class? Most rancor jobs are already nutty, and that basic trooper is one of them. The arcs should get the minigun, but arfs should not, because it is just an arf. Keeping that rocket launcher is alright I guess, but the model change also seems very unnecessary. Rancor battalion jobs as a whole are actually so overpowered its gross, and I really don't think that this change is going to be a good way to improve the server as a whole, but instead just give rancor another op class. This one just has 2 mini guns and a rocket, instead of just 1 minigun.
With these points, I am going to -1 this suggestion.