Bigman ran an XTR carbon booster as he runs vees. However, this doesn't really help either way as vee adaptors etc all help add up to leverage for the brake, so will be different again to a maggie setup You should be fine to run it without a booster, but with will reduce the flex and protect the crossover. Often the performance can change slightly with a booster, as well as the feel, so try one out for a bit and see what you feel like.