Just wanted to Note I posted similar question on reddit and was informed to Burn in the coil before using. I didn't do that with the first build and the flavor was muted and almost bitter. Well I burnt in the second coil and the flavor went from 1.5/5 to a solid 3.75/5 I can taste the sweetness of the juice and the flavor is good too. UB PRO RBA is pretty decent specially for the price. like $15 maybe $20 with shipping from ProVape.
I do plan on buying different coils and different cotton try different settings and see which one works best. UB PRO RBA 4.5/5 solid for the price.
Yes, always dry burn your coil before initially wicking it and also between wick changes.
Different cottons do make a difference with flavor. I tried just about all the cottons out there before I settled on Cottonman's Mavaton's Select and Carolina Blend cottons around 2015ish. I also use rayon for wicking.
For coils, I can't vape kanthal wire, I get an obnoxious metallic taste from it. I prefer SS316L and Ni80 coils.
Happy to hear you're getting on with the UB Pro RBA!!!