So I today I glued a 2.0mm Blastac in red on my Nittaku S-CZ with ST handle. I used it on my forehand. On my backhand I used a new Fastarc G1 1.8mm in black. Two layers of Revolution Nr.3 each on rubber and blade.
First impressions:
From the first touch I noticed a lower arc compared to Tenergy 05 and 80. Good feeling over all. I think the control is above Tenergy when you get used to the lower arc.
Counter is intuitive, you have to open the racket a bit more. Blocking is solid, good feeling and control.
Topspin with a lot of spin and control. You can place the ball very precisely with less speed then Tenergy 05. Short game is also very controlled, better than Tenergy.
Compared to G1 in 1.8mm it is not as crisp and definitely softer. G1 has a higher arc. Just twiddled once so I have to test again next time.