I can think of three additional potential reasons you do not see more difference:
1. You are spinning the ball rather than rolling it. This tends to make everything go long with a little move at the pins
2. You are playing the wrong part of the lane - too much oil (too far to the middle) means to little friction to see a difference) too little oil (too far to the outside) and the Rhino will burn off energy too fast and nullify any difference
3. You are rolling almost end over end - this tends to make all balls make a very little move
If possible, I would recommend you get a good coach to spend an hour with you to see why and help you get a stronger release (for me I didn't understand how to not break my wrist and spin the ball).
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