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Slow your velocities down and see.
I think the sign is the opposite of LATCH_VELOCITY

One of my machines:

MIN_LIMIT = -106
MAX_LIMIT = 0.01
HOME                    = 0
HOME_OFFSET                = 1
HOME_SEQUENCE            = 0
HOME_SEARCH_VEL            = 5
HOME_LATCH_VEL            = -2
HOME_IGNORE_LIMITS    = yes
HOME_USE_INDEX = NO

Are you using steppers or servos?
It's possible you are observing  low speed stepper harmonics. If that's the case, the solution would be to alter the motor gearing to avoid low motor speeds in the harmonics range.

thanks, yeah I think that is the problem. Sorry again to ask: Should this value be positive or negative in my case, where the machines homes on the min X/ Y side (and switch is on the moving gantry) --

I assumed negative as the HOME_OFFSET specifies the position of the limit switch in relation to the actual home position. Is that correct?