As JMC17 said, you have it backward. Vg is thicker, Pg is thinner.
I'm glad you figured out the problem. I've been using my Crown 1 tank for several months now and never had a leaking problem. I use mostly high Vg juice. I fill from the top. Make sure when adding liquid to the tank that you close off the air control ring. I also only prime the coils where I can see white cotton, I never put liquid directly into the center of the coil -- that will cause flooding.
I ordered one of these recently and your fondness for it is one of the reasons why . That tank gets stellar reviews across the board . Think i will probably pick up one or two RBA kits.
Apparently this tank blows away the Subtank's in every way , i did not realize that .