@calvin sextuplets can get the same feel as triplets. It’s just two groups of triplets, essentially. Depends on where the accent is. As far as helping with chromatics and that crazy part, I personally feel that laziness of the fretting hand pinky is a BIG culprit about syncing of the hands. If you’re having issues with synchronizing the hands, you’re playing it too fast. Make sure you’re not compromising speed for strength of your picking hand. For example, make sure you’re not trying to move your fretting hand faster than what it really can go, thus not pressing the strings hard enough and getting a sloppy “dunk” sound. Sometimes the hands ARE in sync, it’s just the fretting hand is moving too fast for the accuracy and strength needed for the notes to be sounded clearly.