RE: V tail setup?
I take it you are attempting slope soaring?
If not then remember - gliders don't fly because of the wind!
They are powered by gravity.
I fly full size gliders and a lot of spectators ask 'What happens if the wind stops?!"
Thermals or slope updrafts merely postpone landing.
Flying in too much wind means your downwind speed relative to you, is higher and up wind slower, and turbulence will disrupt smooth flight.
15-20mph should be plenty to maiden a sloper, provided the slope is suitable, and the plane has been trimmed out properly on low javelin hand tosses first.