I have a Kamry X8 carto tank, in general it vapes ok on the svd, I do however find the draw really tight, is there any way this could be adjusted to make it more airy or is it down to the PG/VG ratio, I tend to use 50/50. Will reducing the Vg help. The tank has the fill screw on top and a screw on the base to hold the carto in place.