I was thinking he might need less incline but if stuck I would try changing the angle in both directions. My V3 has worked well from N130 (finest) up to RL33 (coarsest).If you have not tried adjusting the trickle tube up some, try doing that and see if it helps.
True, he may need to, I failed to read the stuck in the tube part. My bad. Reverse what I said though.I was thinking he might need less incline but if stuck I would try changing the angle in both directions. My V3 has worked well from N130 (finest) up to RL33 (coarsest).