Normal
I think one of the core gameplay issues the abundance of extra balls the tables provide. When I am doing a top 50 highscore run on any table, I will sometimes have 3 or more extra balls saved up which takes away any pressure of a drain since I know there are 5 balls remaining each with the capability of earning even more extra balls. Scoring high on a table like Funhouse is simply an endurance run for me now (that all to often ends with a disappearing ball) where I shoot the same cycle of shots over and over. In fact, the only time I can lose a ball on that table is when one drains before I have completed the Mystery Mirror awards which include an extra ball. If changing the physics to introduce more variability will require too much work, at least start with a "pro-mode" where extra balls are turned off.