Hi you don't mention which board or firmware you have?
have you seen this guide bed levelling.
Best posts made by Javajoeuk
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RE: Bed levelling with 3x independent Z motors issues
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RE: need help to calculate new z-steps
Have a look here to calculate your steps and update your config accordingly.
https://blog.prusaprinters.org/calculator_3416/
Then change your old steps per minute to the new figure.M92 Z800
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RE: help with g32 and bed leveling
@stephen6309 I had the front two drives switched FL and FR on the drive mapping which i have changed and will try later thanks for the help.