Case 580K: when using "float" on FEL going up hill, front end lifts

Hi all- I'm having an issue with the "float" setting using my front end loader on my Case 580K. It works great until I step on the gas (very noticeable uphill) which causes the front end to lift (as if the float is bypassed). I assume this is not supposed to happen? (front loader should float regardless of engine RPM?).



Any ideas on how to adjust/fix this?

Case 580K: when using "float" on FEL going up hill, front end lifts