So I found the mythical gain increase. I never believed it until tonite
I did a flightscope session tonite comparing my trusty G30 10 degree SF TEC stiff vs the new G400. Following various head/shaft combo's, the G400 9 degree with Hzrdus Yellow 6.0 was 15 yards further than my G30 with all round better numbers.
My ss was 107 - 111 which I was amazed about (I was measured at 100 - 104 5 years ago and I'm not getting younger, I'm 43 - mind you I'm fitter I cycle a lot since then and carry my bag a lot more) but I hit down on the ball so my AOA is high which puts my spin in the 3.2 - 3.4k range so my distances were compromised, average distance with rollout was 269 yds.
However, this G400 combo was carrying further than my G30 was with rollout. Needless to say, I bought it. Bet it will be crap on the course - to be fair, the shop has given me a demo to use in 2 rounds I have coming up Sunday and Tuesday so will hold off ordering for me until Tuesday in case we need to go back to the drawing board.. I was delighted with the service.
For anyone with a G30 thinking of upgrading, do it but get on a launch monitor.