I have Duotone Skybrid 85l and now considering the Naish Chimera 70l for V2 FDA and maybe windwing.
I am 73kg and hope some can comment on their experience or advice.?

Slightly different board to the skybrid, rode the 68L in karpathos in varied conditions. It's longer and narrower with a very smooth rocker line. So expect a little more performance for getting onto foil over the skybrid. The length also makes it rail track a little more than the skybrid. Not a huge amount of volume in the nose, so you do have to be careful not to get your weight too far forward when pumping into foil.