OMG. The EX VFT with handshock????

Honestly, I would tell him to get that bow checked out QUICK. My best friend has a EX VFT and it is set at 28" and 63#, and he is shooting a 390 grain arrow (not very heavy), and this bow is dead quiet and shockfree. He only has the original BowTech Hush Kit and a x-ring stabilizer.

I would be worried about that vibration as it isn't what you should be getting from the EX VFT. Definetly have him get it checked out.