I dont know much about the geometry appart from a couple of you tubes vids and 15 minites reading here and there . Ive though about picking up one of the spectrals but always though it was a little to much trail and have thought about changeing a few parts out like you have. Picture look nice...
I would be really interested to hear how the geo changed and how it feels? do you have new figures ?
The 180 zeb would slaken the headtube and raise the BB thats prob a good thing?
what did you do with the shock ? did you keep it 155?