I drilled out my Reomizer air hole to 2.2 mm if I remember correctly. I also drilled the air holes bigger in my IGO-L and the dual holes in my Trident. I never tried dual
coils in the Reomizer but I vaped down to 0.5 ohms with a single and it was great. People have gone down below 0.3 with no issues. People also stuff dual coils into Reomizers, but it's tight
Currently using a Chalice clone with dual coils at 0.5 ohms. I had to drill the air hole bigger and add another one to it.
Once the air holes are right I believe you can lung hit any atty.