Hi Vitali, great choice, you will like it for sure! here is a good thread to check with very similar info, which is quite relevant for all Grip/waveboards from Fanatic:
https://forum.fanatic.com/d/26804-grip-89-foot-strap-positions
As you are a bit lighter for such a "big" board, I'd suggest to put the mast track a bit further back than advised here at first, then see if you need to move it forward if you get overpowered. otherwise very similar settings?