regardign the position of knots at the v line split.
on the psycho there are effectively two sets of v lines which correspond to the a's and b's.
if your kite is underflying, as most 9m do on delivery, move the a' knot away from the kite by about 2cm, until kite flys overhead. stop before it front tucks.
once you have this right then set up the b line to give the greatest depower range, you'll find this by trial and error.
this gives you the shallowest possible aoa but the greatest stability and depower range.
if you want to jump higher and harder then let the front knots out a little until the kite does not come overhead. this gives a more powered feeling and less effective depower but bigger jumps.
also remember that the depower effect is not linear on these kites the effect increases in a non-linear fashion ie the last 2 inches of trim strap matter more than the first two inches of bar movement.