I shot those vanes for a few years, honestly think they are hard to beat. I have switched to Bohning Heat vanes. They are slightly lighter, not anything significant, but stiffer and to someone who can actually hear, she says they are quieter in flight.
Been really surprised how well they steer fixed blades for me.
Honestly in my opinion, not too much to gain in vane weight. The difference in a heavy vane versus a light vane is only a few fps, I guess it helps foc, but I don't worry too much about that. Make sure I have enough, after that, it's all gravy.