Do I want a large center hole with thin side walls that fits tightly in the hole? A small center hole, thick walls, tight fitting? Small center hole, thick walls, loose fitting? Also, how is 400 mesh with 50/50 (10% water)? Should I be looking for 325 or 270? The liquid isn't super thick, but it's definitely thicker than a mostly PG liquid. Hopefully I'll be getting some vapemail tomorrow 