RE: isonic 111 - trouble with back foot
Yes, do as CarlosD says. I had the same problem with Hypersonic, Much backfootpressure and the "fronfoot feels like flying out of the strap.
1 Lower the boom
2 More downhaul
3 The mast a bit more forewards
4 Frontfootstrap a bit more backwards if possible
5 ligth Flexion of the knee in the back leg
6 Extended frontleg