Alot of people find it easier to stay in tight with the elbows on CGBP's, due to the grip. If you are staying tight, with the elbows in, and have your form down pat, then you could easily grow more accustomed to needing that narrow grip to keep proper form. I have the same problem kinda. I mean, my CGBP's weren't stronger than my benches, but at my strongest, I was getting 370 x 4 on bench, and #315 x 5 on CGBP's. That's pretty close. I always felt stronger on CGBP's though, and chalked it up to the elbow thing that I just mentioned. It is easier to stay compact, tight, and get that recoil off the Chest with CGBP's. At least for me. Anything like that going on with you?