Hi all, just got my fist vv mod, a Provari and using it with a J-tank and 3.0 boge. I'm loving this thing so far, I've had the same carto on my vari for about 7 days now and wondering if it's time to switch to a new cart, how can u guys tell if it's time? flavor drop off? Less vapor? Ohms increasing? Also, do U guys clean your slotted/punched cartos and reuse? Thanks in advance for all the help!