read your post, interesting, but looks very easy to mess up and run the nozzle into something it shouldn't. With new Rev. E machines the Z limit switch is in a different position (at the machine bottom).
Basically all that should happen is nozzle stays off (cold), all axis's home, then nozzle moves to right side off bed as normal. At this point the nozzle then turns on, sits there waiting to come up to temp, then does it's normal purge and the rest continues on from there the same as usual. Putting the nozzle against the bed, building pressure, blob, etc. just sounds like a broken nozzle and/or broken glass if not done exactly precise (don't see any benefit to this?)