I've noticed mine have been a little harder to drag. I do take slow draws, and lately they've been multiples (press button, draw 2 or 3 times) to get noticeable volume in my lungs. Not too worried about vapor - just want a hit and some taste. I just ran my attys through the boil this morning, and may contemplate a dry burn. When I need a better hit, I switch to the Boge LR cartos, which hit well, but drain the battery a little faster. I have a 1300mah battery on order to address that. I also ordered some of the 3140 eGo Mega Dual Coil Cartomizers from MadVapes today. They're LR and hold about 5ml of juice in the cartridge.
I guess it's a quest to find the right mixture and delivery... I'm still looking.
So far, I think my mixtures are pure PG. I bought them from a local brick and mortar, and there isn't a PG/VG % listed, and I didn't think to ask when I picked them up.