I strongly recommend getting the USB testers. I used this one:

https://www.amazon.com/dp/B01HXU1PGC

I was able to tune most of mine to a stable 340+ GH/s at 525 MHz at around 12.5-13W (4.8V x 2.7A). All i did was adjust the voltage screw clockwise a bit to match the volts/amps of the faster running sticks. Looks like I'm getting nearly S19j levels of efficiency at 36-38W per TH out of these which is kinda wild.

I did have some finicky sticks under hashing around 40-70 GH/s. i thought they were defective as well but thanks to sidehack & kano's tips i got them out of that range into the 150 GH/s+ range. They eventually dropped back down but I will test on a separate hub & instance of cgminer and report back. I think I should be able to get them to run right with the correct settings & frequency. I've noticed w/ the newpacs some sticks do like to run a bit lower than others.

One of the sticks was running fine at 400 MHz over 200GH/s for a bit but now gets 0 chips/zombie and seems to be pulling little to no amps. Any tips on adjusting the voltage screw? I didn't want to mess with it too much or over torque it. It was always properly cooled.

Note, these seem to take a bit to ramp up to max speed when compared to the Newpacs. It took like 2-3 hours to work its way up to 340+ GH/s so def don't think there's something wrong with it if it doesn't immediately hit the higher hash rates.