For example, when I change from a PLA glass that's just got glue on it, to an ABS glass that's got a skin of window tint on it, I tweak my max height in both the EEPROM settings (x, y and z are set to the same value) as well as in the Repetier-Host printer configuration screen.
Because Repetier is now the shipping firmware, the 2nd edition of the manual will cover exactly how to set it up. I'm also planning on doing a video that illustrates _exactly_ how to calibrate the three towers and the delta radius. I will try very hard to do it in the style of /r/explainlikeimfive.

I can just about guarantee that without the PEEK fan, you'll get a PLA jam within an hour of turning on the hot end. The fan makes a _huge_ difference. I'd also recommend installing a layer fan for use with PLA. It really improves the print quality.
g.