I'm still experimenting with rebuilding heads so everything is always shifting ohms-wise and wick-wise and even wire-wise... went from silica to cotton... then tried a standard coil, the vertical microcoil, and the horizontal microcoil... 30g kanthal, 32g k., tried fluffy cotton wicks, then twisted wicks... larger coils wraps, smaller coil wraps....
But what I find is that I'm not a "set it and forget it" vaper. Even when a head's hitting great, to me the sweet spot shifts depending on if the mod is cold or gets cold (might click it up a step if only taking a vape every few minutes, or when I first pick up the mod), or if I'm chain-vaping I might click it down a step or even two once it's really warm and I'm hitting it hard.
Also the Captain Black NET that gunks up my IGO-L dripper... I sometimes start out at 5.5w with a fresh coil and wick and end up kicking that way up as I go along during the night and the coil gets gunky... sometimes get as high as 11w before quitting and tossing the coil.
But mostly I vape between 5w - 7w, probably.