Printing too high Folgertech Kossel Delta printer

Hi everyone, not sure if I'm in the right place to post this, but here goes... I bought a Folgertech Kossel kit and have assembled it from A-Z, i followed the instructions for setting up the marlin firmware and variables as detailed in the
manual, but whenever i try to print within Repeteir I'm about 5mm to high, which is roughly the offset i used for the Z_PROBE_OFFSET a value of -4.7,

Anyone got any ideas, i've spent more than a day on this and I'm not getting anywhere on it.

Here is the link for the google drive folder with the manuals among other things that i've been using to build the printer:

https://drive.google.com/folderview?...28&usp=sharing