If your tilt is set as close as you can eyeball to 34.2, you should have picked up the other slots (assuming that the LNB assembly hasn't partially failed).I give up! Covered ease/west and was able to get nothing. Reset settings and found that it is the west lnb which is getting the 101.
Anything that is over 27' in height + the height of the mast at a distance of 40' (40 x tan 34.2) could be partially blocking the signal. Moving the dish a couple of feet to the East might help if the tree doesn't have friends.