I have never edited so fast in my life!
I believe that is the problem as well...not letting the bold slam forward with some force to lock the BLH into place.
Thinking back to hunting in a laydown blind during the heat of the action...without looking would sometimes take my right hand index finger and thumb and pull the action open a bit and feel for a shell to be sure I reloaded.....then gently close the action.....that definitely causes my problems!
As far as the other issue of the third shell getting stuck in the action/carrier....I think the shooting four boxes will loosen things up. I look forward til then!