@VapeSnow you can do dual coils on ur RM2 but most prefer single coils as you would have to do stacked or parallel dual coil because of the single air hole. If you going to drill, id go 1.5 - 2.0 -2.5 then 3mm. .5mm jumps on a Reo seems to be really big. I went frm 1.5 to 1.8 and I only do lung hits, the flavour is awesome. Practice with a couple of different ohm coils first on a specific builds before you go to the next size hole