So, I'm pretty sure I'm not the only one who's been thinking about this, or rather struggling with this before. Playing tight and clean under high gain, may it be Rythm or Solo. I opened this thread for all of us to share opinions and tipps to improve ones playing.
Now my contribution would be this:
Always play with a Metronome - otherwise this ain't gonna work in the first place
Play with too little or no gain at all - pick intensity and little flaws usually tend to get lost under high gain, especially with a too forgiving setup
Play with the most disgusting "Black Metal" Sound you can create - meaning a lot of highs and lot of gain, this is the other side of the thing mentioned before, if every move you do creates noise, you will start to play more economical
Record yourself and listen to it - pretty self explanatory, init?
Start practicing slowly - if you start doing things the right way and slowly in the first place, your muscle memory will help you to do things right at full speed
And last one: there is no cheating or faster way - playing well means practice, lots of
And a really nice workshop by Josh Middleton of Sylosis that helps a great deal:
https://www.youtube.com/watch?v=zHBYuj9IBMsSo if you have other tipps, keep em coming!
Cheers