Some of my games are on hi-tap, others are not. It really is a game by game decision for me.
Personally, I am more interested in enjoying the game than I am in keeping the play "as designed". So some games get their angles cranked up to their highest possible pitch and others remain at the 3.5-4.0 pitch.
As I analyze EMs that I have owned in the past, the only games I hi-tapped were 2" Gottlieb Wedgeheads. I made the decision to increase the "pop" and speed of the play. Even now, my Kings & Queens that is currently located at Rat_Tomago's is on hi-tap. I prefer the play of K&Q on hi-tap. Yet my Atlantis is not on hi-tap and I do not see a need to change it anytime soon.
The beautiful thing about hi-tapping is the reversibility. If I play a game on hi-tap and I do not like the play, I can spend a few minutes and change it.
Marcus