All of my Fox bows, including my Arctic, brace out higher than that, and yes, they vibrated with the lower brace heights. I usually shoot them with a flemish 16 strand string of either fast flight plus or BCY8125 with four padding strands of dacron in each loop. I use Sims compound string leeches tied in place for my silencers. Not very trad, I know, but it works great and if you play with a chrono for a while and adjust locations of the jax, you can sometimes get no speed loss.
Brannon