I prefer a 6 wrap .7 ohm to .8 ohm on 1.2mm to 1.35mm ID tightly squished a few times when mounted and hot then cotton wick a little tighter than what most like with just enough tails for the ends to be on the deck on an RM2. That is however with either a Reo Grand that has fuse mod and brass firing pin mod, or on my pdib OliveR which does not need modification for voltage drop. I recently started using Orbtronic SX30 batteries in OliveR and went to 5 wraps to take advantage of the fatter (but slightly lower voltage wise) middle section available compared to the AW IMR18650 1600mah.
As far a popping it is
juice dependent and with a
juice prone to popping good compression of coils, tighter cotton, often squonking saturating the coil, and coil break in are what I have found help. I squonk every other hit or every hit ( if in doubt squonk ) saturating the coil well.
With 1.2 ohms on a stock Grand (I am guessing 8 wraps at 1.5mm) I would suspect some bad lag issues and less than peak performance. With proper cleaning and Noalox .6 ohms is,where you start having problems. When Rob gets the sub ohm kits available later this month the Grand will be much improved. (assuming the final product performs as well as his prototype video). I was able to go from .6 ohms to .8 ohms when I did the fuse and brass firing pin and had better performance and battery life to boot.
Two of my RM2's have MM in them and 5 wraps of this rope coiled at about 1.8mm ID has worked best for my juices (near 5/64" ID).
