Hallelujah! 
I was about to become one of those who gave up on the Boss. 
I bought mine 2nd hand.  Had it running for a while but it got out of adjustment and I couldn't get it running. Double looping and jamming.  I followed every youtube video out there.  No luck.   
I called Tippmann and Jamie spend a lot of time with me and still no luck. 
I sent it in and he rebuilt it, replaced 1spring tuned it up and Shazam! It works great. 
$45 for tuneup, $5 for spring