Homing uses the specific files for each axis and are combined when you do all check the Homex.g and compare it to the Homeall.g File think you will find the difference is in the F parameter.
I cant tell you what to alter as it appears yours is a cartesian Printer whereas mine is a delta that only uses the Homeall one so not had to even look into the individual ones at all
The files can be found in the /SYS directory on the SD Card.
You could also post your Homeall.g file here for people to check and give better advice?
HTH
Doug