Slowed down my glue game after pretty much the same thing happened to me last spring, but here's the part people miss: it's not just about switching to a slower PVA, it's about how much glue you're laying down in the first place. The fast-set stuff grabs so quick that a thick bead never gets a chance to soak into the paper before it skins over, so when you crank the press the spine is basically glued to itself and not the block. Going thinner on the application and doubling the dry time between signatures did more for me than any glue swap ever did. If you do try a slower set, test it on a scrap block first because the open time changes with how humid your basement is, and a wet shop will wreck your schedule way worse than a fast press ever could.

Had the exact same thing happen with my 2006 TRX450 at Sand Lake. Some guy in the parking lot told me my jetting was off for the coastal air and I just nodded and rode anyway. Two trips later it was popping and losing power on the dunes, plug was chalk white. I ended up going up two sizes on the main and it ran perfect after that. Now I actually write down what guys tell me at the trailhead, cause that old dude at Wanoga was probably right too.