Sounds like you have everything in hand and all is going well. I chip pine only. Glad when I got the
M6040 and could go to the larger Wallenstein
chipper. The BX42S had a smaller discharge chute and lower air flow. All that, combined with the fresh cut "drooling" pines DID lead to the chute plugging.
The larger tractor - larger discharge chute - much higher air flow - now the plugging chute is not a problem.
I had two solutions when I had the BX42S. Do my thinning and piling in the spring. Let these pines dry, in the piles, for a year. So my spring chipping was always with year old pines. Then when I'd get ready to chip - collect up old dry limbs. Every so often send a big, 'ol rock hard limb thru the
chipper. This would clean things out.
If you have never chipped fresh cut pine for hours - you just don't know the joys of sap dripping off the leading edge of the discharge chute.
You probably get this effect from most everything that will be chipped green. At least, the pine sap smells good and is accentuated by running the trees thru a warm
chipper.