I'll throw something in here from experience learned. When using the PALS, or something of the sorts, to align a saw, you need to loosen 1 of the 2 other bolts holding in the trunnions. Without doing so, you are actually putting them in a bind. So, from past experience, loosen the two rear trunnion bolts, and then one of the forward bolts. You do not have to loosen the front bolt a ton, just enough for the trunnion to move under it. The forth bolt is used as a pivot point without being loosened.
Side note - I speak as an owner of a Delta contractor saw. Yours should be similar, but bolt arrangement might be off. The first time that I aligned my saw, had it dead on and then within days, it was off. Loosening that third bolt for me was the ticket after much research.