Which hardness will you put on your BH for the h8-80? Also, which booster are you using on the 80 sponge? Does not react well the Haifu Nat booster, nor seamoon.
I have a similar blade (golden HL5). Currently I play with rakza z on BH. I used to play with commercial h8-80 in 37. I tried 38, but felt considerably harder than 37. I tried RZ coz I felt the H8-80 lack in the game after the 3rd ball, I mean it is harder to be consistent. I am better in that area with RZ, better blocking, better control. But too hard, I need to engage to much to open up, if I brush the ball only like I am used to with H8, the ball just goes into the net. It feels like the rubber does need to goes into the sponge to work and create throw angle.
I gain everywhere with Rakza Z, but I lose a lot in open up. You could think, oh keep the Rakza and improve. But I tend to focus more on the first 3 ball in my game now. I realised I tried too much to do like FZD, sending it both wings and attack every ball. Instead, now, I am focusing more on the first 3 ball quality, and less in longer rally. I am able to compete to higher level like that. So in that sense, I want a softer rubber to be able to open more easily. The role of my BH, is to open up with massive spin, to receive an easy ball to finish with my FH. Kinda like Ma Long. His BH, is more controlled and less aggressive than FZD or ZJK. But uses it to create a good ball for his insane FH.
I can go for H3 37, and claim that I play with Ma Long's setup haha. I also use H3 nat BS. Currently 40deg, but thinking about going to 41. The Haifu booster I have is really powerful.