This seems to be a long post so bear with me, I just wanna share little revelation I had which probably most of you already know
Ok so I have been playing for something over 4 years...and all the time I had this crazy problem with picking hand while there was never an issue with my left hand.
As a matter of fact my left hand evolved pretty quickly and naturally, so I never had problems with legato playing and everything I tried pretty quickly became easy to play even at faster tempos
But all the time my picking hand was giving me headaches...Every time I tried to speed up and keep it that way for longer amount of time I experienced pain in my thumb.
So tried changing the way I hold the pick but none worked.I also tried loads of picks, settling on big stubby since it gave me the least amount of pain
And today I was just curious about my problem and started googling on carpal tunnel syndrome and I found this interesting topic about anchoring on ultimate guitar forum (I can`t find the link now, just google it if you want to see it but its mostly 32 pages of flame war)So definition of anchoring is when you rest any part of your wrist or fingers on guitar.Be that pinky on pick up or wrist on bridge
Some suggested that is bad for you since you are not fully using your muscles and some of them are just getting tensed up for no reason plus you are limiting your hand movement.It was kinda contrary to what I have been told and that was to pick only with my wrist and if you use your elbow in anyway you are doing it wrong
so I was always resting my wrist on the bridge or strings.
Add to that that I started with mainly metal music which uses a lot of palm muting and you can see how the bad habit evolved
So I tried picking without touching any part of the guitar with my wrist unless it was necessary (palm muting again)
At first it was kinda strange, I felt like I was thrown of the cliff without any knowledge how to use my wings but after only a couple of minutes I started to notice the difference, I really could play as fast as I wanted to and there was no pain nor slightest tension at all
I was worried about noise and how will I stop it but it all came naturally, my left hand was as usual taking care of the higer strings and my thumb just brushed over lower strings instead of my palm and thus the noise was never there to begin with(and I dont use a lot of gain since I lately found out you really don`t need that crap...it`s all in the right hand dynamics, everything else is just bunch of noise and compression that fucks up the articulation)
Anyway I am still pretty insecure with this new technique and it will take time and patience to break the old habit but man, AM I HAPPY...I FINALLY FOUND THE SOLUTION
Congratulations if you read all the way to the end. I hope it was worth it