I have upgraded from the cig-a-like disposables to my Provari and Protank about a month ago. Love the Provari and I love the Protank so much so Ihave 5 of them. My protanks came with 2 coils of different ohms. A 2.5 and I think a 1.8ohm. I am going to order some replacement coils. What size should I get? Is the lower ohm better than the higher ohm rating? Which size would be best to use with my Provari? Thanks Stu