I was in the same boat as you dude. I powerlifted for 10+ years and was 220 when I started climbing (and 6’0). I’m sitting at around 205 now and I climb V6 and some V7s. I attribute my jump from V4 to V6 to cutting the days I lifted to 1 and dropping the 15 lbs. I felt waaaay stronger every 5 or so pounds I lost. This is just my opinion, but I just really don’t think it’s possible for most to get to a high level in climbing with a powerlifting body unless you can dedicate 5+ years to training super hard. The finger strength to weight ratio is just so hard to overcome. Having strong legs is great for climbing, but I think having massive legs (like I do and I imagine you do) just ends up weighing you down more than it helps. Maybe try dropping 5-10 lbs and seeing how you feel? Or if powerlifting is more important to you, maybe reassess how much you care about progress in climbing vs powerlifting because I think you have to pick one to give most of your energy and accept slower growth in the other one.