I think that my 238.4s are around even balance or maybe a little headlight and I play with a one-handed backhand. My 292.3s have swingweights of 386. I can play with them but my backhand and serve aren't as effective. I guess that the dropoff in RHS outweighs the benefit of plowthrough. I think that I'm about as high as I can go with swingweight because of the backhand and the serve. I did a lot of experimentation with lead tape back in 2011, basically adding lead tape until where my game became less effective.
I could definitely achieve the same SW with lower static weight but I need the lead at 3/9 for stability on the YTs.
4 x IG Prestige MP, 70 cm, 376 grams, 386 SW, ALU Power @54, Prince Syn Gut 16 @58