Hi KR, vaping w/ dual core 3ohms with no problems here. Just don't get low resistance cartomizers or atomizer unless you want to stay w/ low voltage vaping. From what I remember (and I could be way off) LR is designed for lower voltage mods to perform like they are higher (5v) so not your best purchase to get the full range for ProVari.
Still learning here so someone can correct this if I'm off. Congrats on purchasing your new ProVari!! I love mine.