Haas VF help

After I moved my VFE-0 MILL to my home shop I have been having an issue.
When the spindle starts with a speed command of 7500rpm, the motor load goes to 100% and stays there for 5-10seconds with spindle running probably 2500rpm, then it will speed up and amps drop to normal level. I have to run my rapids at 25% or put a dwell of 10seconds.
I have a phase converter, same one I used at last shop. Only thing that changed is my .post . This is a 1997 model. Any suggestions?

How far away is your Service transformer from power company? Wire Size? ...test incoming Voltage when starting spindle. Fadal has a Parm for low voltage...I think

my two cents,
DJ