Re: Would I be better off switching to a lighter string for speed picking?
I dunno, I don't think you'll get a lot of ease out of switching strings; best to either work on your picking technique or deburring your picks. Sounds like a problem I had which is attacking the pick with a hard grip and having the pick tip aim up a little bit towards you.
1) loosen your grip a little. You might be pulling your pointer finger in too tight, curling the pick under.
2) reaim your wrist a little. Pull your small fingers up off the body to get the pick aiming perpendicular to the strings.
3) deburr your picks. Use the smoothest emery board you can to buff the pick tip to get rid of that casting line. Maybe rub the edge on a candle. You'll need to clean your strings too if you do this.
When I started relaxing, I started picking really fast. I would really not suggest changing string gauge for this. If anything, go for half-round strings (which will dull your sound a bit but will get way faster on speed picking)