Aahhh, back in the day when I had nitro...that was well over 10 years ago. I haven't been into brushless for the last ten years only the last 4-5. I didn't have many mills at all - OS .10 , ?don't remember what? .12 , and a novarossi .15 with a tuned pipe
The .12 gave me the most grief, slightly more difficult to tune and the filter I had kept falling off. The novarossi was kickass given it was a high end motor with tuned pipe. It was also in an on-road car so the lack of dirt meant less maintenance.
Although the .12 was a little more finnicky than the others tuning wasn't really a problem for me because I'd had practice tuning some motors my brother never got around to using. They were .15 air motors (maybe OS ???). I bought and fitted propellers and mounted the motors to a bench vice in the shed. Was good fun for a 14-15yr old

That was 20 years ago! I am reasonably shit at tuning now. If I had a nitro of my own I might learn to tweak again but after having tried to help friends with their nitro (and after they have stuffed with it badly) I just find them really frustrating now.
I don't mind the sound of them except if they are out of tune. It irritates the crap out of me when the owner cannot tune them because I can hear it but there's not much I can do about it. At that point it's a bit like - shake my head walk away, play with my brushless and go home. There have been times when I have helped tune them in but I'm just not good at it.