Heres my thoughts on this. You use egos the pair of you, and shot threw 10 atties in 3 weeks. Unless I misread.
1- Your in that transition period where cig toxins come out, and flavors change
2- Your vaping like you smoked....5-10 minute vape 2,3 x's and hour, probably going through a 1/2 or whole cart each vape...ur workhorsing the atties. they will burn out quick with bursts like that, and youll also burn the wicks and carts..check carts for melted circles on sides.
3- LR atty needs dripped or blue fluval straight shot to flow well enough, or you burn wick.
4- put atties in shot glass cart down at night- that alone will extend atty life 3 fold.
5- hot water cleans atty just fine, just be easy in working liquid back in, as wick absorbs water, and water evaps quicker than liquid absorbs. 2 sec pulls until your getting good taste.
6- if wicks are scorched and atties are nasty, try removing wicks, dry burn, and use blue fluval carts to buy time for next shipment.
7- don't give up, you'll figure it out, we all did.