went for red BG66 on mine...apart from the one with ZyMax66 Fire. I believe Paul had a bit of a nightmare stringing them and had to change string for that one. He might be able to expand on that.
The JS Ahmad uses the same material as JS10 but with a thicker 7.0mm shaft and it is available in 3u. Same 3/5 balance and 4/5 stiffness though the RRI is slightly lower. This might be the model that addresses the "power deficit" due to weight.
Gotta agree there. Red really looks bad on the JS10. It feels like a white or nothing racket asthetics wise.
IMO colored strings look cheap. White looks the best. Yellow ones are acceptable and pink ones for your girly day. Even red strings on a MX80 look very strange.