Good posts. I agree with everything but the diameter being too big. IME larger wire needs a larger diameter on the wind to hold enough
juice. This way the wick doesn't go dry mid pull.
What you need to be concerned with is wire length. This means less winds on the coil as the diameter increases.
@ 2.5 mm on 22 gauge I would shoot for 4 wraps and single coil... especially with that rebranded LG HE2 cell.
I run duals @ 24 gauge @ 3mm @ 4 wraps and they work just fine. Ramp up instantly.