WAS (what Amanda said)
I'll add the VT Mega tanks are
absolutely unusable max VG. The coils (the holes) are nowhere near up to that job.
IMO, you need
at least 30% PG to wick those... They will not perform well even at 25%.
(Not crazy about the Ti coils even when performing properly.)
Lower ohms (less resistance) will make more heat and therefore
use more juice at any given wattage.
A modern .5 ohm coil will drink 5mls of juice in a big rush... farrr faster than your current tank.
5 mls/day in your Mega tank could easily equal about 12 mls in the Crown. It's a cloud beast.
And yes, your VT can easily handle .25 ohm coils... lower even.