Mt Vernon AE Insert -- need more heat.

But if the pellets arrive at the retail location and sit outside for a few months how does that mess with the PFI data?

Another bit of information.
Quadrafire says that the vent should be cleaned every 3 tons of pellets. I just cleaned my vent and the increase in heat is dramatic. I used to get convection air temperatures in the range of 230 to 250 degrees running in manual with flame height 4. After cleaning the flue, and especially the screen at the cap, I am seeing temperatures of 260 to 290 with the same fuel and the same settings.
Even though I thought my stove was burning well, it wasn't performing as well as it could. I guess more frequent cleanings are in order.

A clean stove is a happy stove.