Dude I FEEL you. Like in my literal bones.
I actually just had a breakthrough last night (maybe? we’ll see if it’s reproduced when I get time to play later today) I was topping out on a 2nd position Cmaj scale at around 120-140 BPM, I originally thought it was due to inaccurate picking but that didn’t make a tonne of sense to me, since I can play OTHER non-scaler patterns significantly faster and cleaner. I think what was happening was that if my fretting lagged or rushed (hah let’s be serious, it was lagging) the pick to fret coordination didn’t line up and I’d lose track of what string I needed to be on because my ears weren’t getting the proper cue to switch.
I know that’s probably not chunking per-se and I’m being a bad person with this ‘advice’ such that it is but whatever weird magic happened for 20 minutes last night at 10:30pm after I’d been playing some simple folk stuff and throw in an occasional fiddle tune, I ran my cMaj scale 40 BPM faster than I’ve ever been able to. We’re not talking a 3 or 5 BPM shift here, it’s not even close. I never thought I’d get to be one of “those” people with speed breakthroughs but…
For whatever reason, I was able to lighten up on my fretwork so that it didn’t feel like I was trying to imprint string outlines into my guitar and… like I barely want to verbalize it but I hit 170 BPM quarter notes up and down the scale last night. That’s an EASY 40 BPM jump from what it was before. My main issue (I think?) was at those faster speeds, I needed to be absolutely sure that the shift across the B string was nailed on accurate, or the entire cadence upended itself and it sounded like I couldn’t even keep track of the number of picks per string.
I don’t know if that’ll help you at all, and I don’t want to side-track this thread in the slightest so
tl;dr: I had great (possibly flukey) success by lightening up on my fretting