No matter where the wire goes, the aquastat won't let B1 or the burner start up above the high limit. If it does, you better change the aquastat.
Some problems with outfires are caused by not having a 40-50 degree difference between the high and low limit of the aquastat. We had our first outfire yesterday at efm. The boiler was lingering at the high limit all day and whether it didn't fire enough during the warm spell or whether the cold water returning to the boiler sent the temperature below the limit of the outfire control (L6006A), I don't know, but I came in and found an ash can full of raw coal yesterday morning. I can hardly imagine if the outfire control had not worked with a feed of 8 teeth for 12 hours! In our case, the heating pipes hold much more water than the boiler, so killing the boiler with cold water is a real concern if the circulator doesn't run for a long period of time.
I think your problem is directly related to the aquastat settings and not the coal. Our stoker is set at 150-200.