Hay skyking I'm using a tigershark .91 and it likes a 13x6 a lot but it also likes a 14x6. the 13x6 gets me a lot of speed where the 14x6 seems to make a lot more bottom end pull, the plane wants to jump off the ground a lot sooner. This is on a GP 300s it has the same wingspan and weight as the VF 300. I have a SuperTiger .75 I use on an ultra stick and it also likes a 13x6. I would start with a 13x6 for break in and adjust to your liking from there.

Miloh.