Regarding overpowering Wong hybrids, I've tried it a few times.
I've put three 9/16 band on my first 55 Wong that he put two on when he gave it to me. I couldn't hit anything. I don't think it's shaft wobble because it's semi enclosed track. But it was probably the recoil lifting the muzzle a bit making me shoot low.
I went back to two bands, which looking back, I should go back to 9/16 also. With the original setup, one of the first fish I shot here was a 43 lb cubera. Long shot too. I was on top of his hole and had chummed it. I came back and there he was, looking out into the channel. I hit him near the lateral line going forward. The shaft came out through the gill plate. Solid shot.
Now, Jake the muscle man has convinced me to use 5/8. He even shorted his to 24 inches from the 26 and 27 that Daryl puts on them. I guess I'm getting used to it but I'm going back to thinking that the smooth shooting 9/16 may be the best. I think I actually tense up right at the trigger pull anticipating the recoil.
I'm not a gun expert by any means. I've only shot Riffes and Wongs since I seriously started spearfishing. But that's a little I've learned.