I usually buy 26g/30g clapton coils with a 2.5mm ID, but when re-ordering from AVS I accidentally put 28g/36g and have no idea if I need to do something differently with them, mainly because these are tiny. I'm using them in the recurve RDA, should I wick them differently? And am I going to need to crank the watts up since the resistance is so high?
Nope, you dial it down - maybe dial it WAYYYYYY down. Depending on what you like vaping at, you may end up dialing it so low, you'll have battery power for DAYS. Higher gauge wire (40, 38, 36, 34, 32, 30, and some 28) = higher resistance. Higher resistance = less power to fire. Whereas lower gauge wire (26, 24, 22, 20, etc) requires more power to fire. Remember the higher the number, the less wattage. The lower the number, the more the wattage. It's like comparing highways or pipes. The more lanes on a freeway (lower gauge), the more cars (watts needed) are allowed to pass through.
Also material impacts resistance too. Nichrome-80 and 316 Stainless has a lower resistance than Kanthal.
As for wicking it, as long as it's a 2.5mm inner diameter, you can wick it as normal. Any larger inner diameter, use more wick, smaller diameter, less wick.