i have extensive experience with the 07 sonics 8m and 11m, but not the V-sonics. since the A-KPO is essentially the same, i will offer my advice anyway

11m sonic
63kg rider
125 twintip
like to ride powered and boost big

light winds 10-15 knots: B3, F3/F4 on middle knot

medium winds 15-22 knots: B3, F2/F5 on middle knot

strong winds 22-30 knots: B2, F1/F4 on longest knot

i have found these to be the best for me, small changes like altering which knot of the three that you tie to can make it turn a little faster or be a bit more "boosty" in the jumps. changing B3 to B2 or B1 drastically increases the usable windrange of the kite, the stability is MUCH better as you move the rear attachment point forwards.

for the 8m, i only use it when the wind is consistently over 25 knots, and i always use B2 for the rear as it seems to flare a bit if it's on B3. the 8m is a gem of a kite, probably my favourite kite ever.

use the rear line adjusters to trim the kite at full power. try them on the shortest one, put the kite at 45 degrees and sheet in fully. if it falls back into the window (stalling) then move the knot out by one. if it still does it, move it out again to the last knot. the sonics have to fly "loose" to generate maximum power - once you have it trimmed perfectly it will generate massive power at speed. they are easy to oversheet in the hands of a newbie.