Have you retuned the bow since changing? Could be your centershot and/or nocking point needs adjusted.
Something that I found by using the WB is that, because the arrow is "contained", it even more necessary to follow through at and after the shot. If the bow moves then the arrow has to go in the direction the bow moves. If your equipment is tuned and you hold the shot then accuracy will be there.
That's why I took the WB off. I gave it a good try to see what it was like and me and the WB didn't get along. My form isn't as perfect as it once was and I don't need anything to exaggerate my little mistakes.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver