I agree w/other responders here. We used to have ILS tractors & I never saw it "kneel down" for hard pulling, or excessive slipping. The only thing I know the "% Slip" meter is coordinated with is picking up on your 3 pt hitch if you have chosen to limit the slip. If the tractor is hooked to a drawbar item, then it does not pick up anything. I realize this is not what you were stating, but again, I'm sure there is no adjustment to the ILS during slip conditions.

I'd probably consider buying a radar (don't think you need the dual radar) for that tractor to get accurate A/hr work info.