Let me give you an example...
Ironman: 'Dialing it in' involved installing the shaker motor, the ramp mod so it doesn't STDM, turning off the orbit post, tweaking the shooter rod to make it so you can make the skill shot or the long orbit without much issue, switching the rubbers out to white, setting the monger difficulty to extra hard, the ball save time to 8 seconds, and tweaking the monger flange to avoid airballs, LEDs in the right places and a subwoofer if desired, outlane posts set wide open, the right pitch for your gameplay style. Now it plays like a dream.
XMLE: Installing the Cliffy, adjusting Wolverine to be sensitive and a little further to the right, and doing the post mod, and pitch set. Installation of the Shaker and FF Kit. It's all dialed in.
IJ: Dead Drop foam in the VUK, POA useable, Video Modes set to correct difficulty, Flippers rebuilt to make the ramps, right outlane escape possible with nudge, but not every time, etc.