Well, yes, most folks at high nic (like me) are using less wattage and weaker delivery systems overall.
The main thing is, yes more wattage will provide more vapor but I'm not entirely certain where one might reach a point of diminishing returns. I would IMAGINE (and I'm speculating) that you'd inhale more vapor at higher wattages but I'd also think there may be a point at which you've reached maximum absorption IF it's possible to reach a point where you are inhaling such a huge cloud, you're not increasing it 1:1 although perhaps some. Also depends on length of inhale and etc., to confuse things further.
I will say, if you are chain vaping, you can up your nic, or you can up your wattage and lower the resistance of your coil, and that may help, but I'm not sure exactly which strategy is going to give you the best return.
I would suggest finding a vape style that works for you and your body. That would include resistance of the coil, type of inhale, wattage, warmth of the vapor, etc. Kind of fine what type of "vape" you like best, and then experiment a bit (and if you are sub0hm which it sounds like you are) if you make nicotine changes, do it in smaller increments.
If you want, you can try higher ohm MTL vaping. You may love it or hate it, but you won't know until you try. It is in THAT instance where you will find higher nicotine vaping.
However, just find a vape you like (IMHO, you don't have to do it that way, but liking your vape is kind of important) and then work out nic from there.
Best of luck, nic strength can be confusing. Amount that you vape (frequency I guess I mean) also plays a role, etc.
Good luck, and the general principles are if the vape is glued to your hand, you may need more nic. If you get nic overload symptoms, you may need less nic.
Everyone absorbs it slightly differently I'm guessing as well, so what works for YOU may not work for another person and etc. But if you stick to those "general" principles I'm betting you can find the right vape and nic strength.
Best of luck,
Anna