What I am suggesting is to make those coils really tight, which is quite doable with the electrically annealed handwrap method. Strive for the best installation you can get, rather than settle. I had lots of practice, and so will you if you stick with it, and the coils will only keep getting better.
A coil not in contact with juice, ie. a gap, results in coil glow instead of juice being vaporized. In areas where the contact is semi-tight, you'll burn your juice, and if those areas make up 10%, then you'll have 10% burned juice with the 90% otherwise good. Thus it affects the taste, and a completely tight wrap will give you the very smoothest and best of it. This will hold true for any wattage whatsoever, it's only really an issue of degrees. I'm just relaying some tips and what I have found to be optimum.
In regard to flavors, I also ended up cutting back both my nic and flavoring. I see Genny RBAs like clean high-power vaping amplifiers ... lol ... tube mono-blocks, please
My DIY is about as thin as it gets. 1 drop of concentrated flavoring to 15 - 30mg of unflavored juice is all I need now ... any more, overkill.