For what it's worth, I had a Traeger Lil Tex for 5 years and found the only time I could obtain 400º or if lucky, 415º, was when the pit was empty, no to little wind and above ~ 60º ambient..For the most part,
anything 325º and under was easily attained...At 375º and up, I felt the pit was struggling..I wouldn't use it in the Winter for that reason...Didn't seem to matter what pellets were used.
There is a restrictor in the auger, that if removed will allow for more pellet flow (Pro22). The 34 doesn't have it..If removed, more pellets will be delivered to the pot = faster warm-up and higher
temps..However there is a price to pay. That is smoke and low temps won't be as controllable. The 34's burn-pot has two more holes to maximize combustion.. If your Pro is a 34, you are not alone with
heating issues that to my knowledge, there is no fix for.