Keep it up! You can push it to 200+! 200 is only 17% faster!
This speed is where you have to rethink technique!
When you practice with a metronome and gradually speed up, what you do is you use the same muscles and making them stronger so you can move faster.
But it has limits because some muscles actually are holding you back at this speed. Pay attention to which muscles you can let relax but maintaining the speed.
That could mean you might want to turn the pick or your hand.
When you find this out you will jump about 10-20% in speed easily!
I want to hear 200!
Hint:
If your limit is 170, go to 180 and pick 1 note, then pick 2 and stop on that speed until it feels comfortable. Since it's only 2 notes your hand doesn't' get stiff. Then go to 3 notes, then 4.
1 bar with 2 notes, 1 bar silence, 1 bar with 2 notes, 1 bar silence.
1 bar with 3 notes, 1 bar silence, 1 bar with 3 notes, 1 bar silence.
1 bar with 4 notes, 1 bar silence, 1 bar with 4 notes, 1 bar silence.
1 bar with 8 notes, 1 bar silence, 1 bar with 8 notes, 1 bar silence.
Then go to 190, 200.