ever stop to take notice of the direction of your pick?
if you are playing an even number of notes, let's say four.
if you start on the downstroke, you would pick down up, down up.
this leaves you in position to repeat the exact same motion.

odd note groupings are different.

if you pick aan odd number of notes, it leaves you facing the opposite direction.

so if you are playing triplets, the first three would be down up down, the second three would be up down up, leaving you in position for the downstroke again.
if you have a weak upstroke, this can make it sound choppy, and ultimately hang you up and make you play sloer and with less fluidity than you are actually already capable of.

try setting a metronome at a comfortable speed, and picking the high e string with three notes between each click, being concious of the direction of the pick on the one beat, or the "click"
just play the string open, listening to hear if the notes sound evenly spaced.

then try four note groupings, first starting on the downstroke. after you practice that for a while, try four note groupings starting on the upstroke.

all that done, now play a scale up and down the string in triplets, then four note groupings.
you should start noticing a feeling of of more control over your picking.


then, why not try five note groupings? six? five is weird at first, but similar to three in that the pick ends in the opposite direction that you started.
doesn't take long before you don't have to count, and you just feel the timing.