It can also be the alignment of the VUK. I had this problem on both TSPP and LOTR. You can pick up a diverter kit from Pinbits that sends the balls from the POTD to the wire form minimizing the stacking in the shire. IMHO the game flows a bit smoother with the kit installed. You will just have to hit Sam more from the flippers.
Good Luck.
Oh, don't discount changing the sleeves. That makes quite a difference as well.