Try to open your stance a little more. My friend had the same problem with his Baby G he would get hit almost in the fatty part under the thumb. He got the suggestion to open his stance and it worked.

Cybers have a lower brace, therefore you are probably laying it into your arm from torque at the shot but never knew about it till you got a lower brace bow.

Putting silencers will not cure the problem, that is a big myth and someone is pulling your leg. Rebound should not happen regardless, and you certainly shouldn' t be allowing the bow to flop over at any point of the shot sequence.

If the drawlength is correct for you, then as Arthur P mentioned correctly abobve, the next step is to check ATA and brace to ensure they are correct. If they are, then it is simply a matter of form or you have been setup improperly. Seeing as you shot a 3D without touching once, chances are you are probably starting to get used to the bow and running your grip correctly now.

Good shooting, Pinwheel 12