I am not aware of the pressure's going to the orbital. The facility does not have the fitting to attach, I have ordered - waiting on arrival.

I removed the relief valve bolt and removed the spring inside. I examined the spring for wear/tear & tension. I examined the housing as best as I could without a scope.

I lifted the rear, and (while lift is KEY OFF ENGINE OFF) tried steering - it was still rough.

Now, by me saying rough I mean when I turn the wheel slowly in either direction, it manages to move the tires smoothly - while I try to move the steering wheel quicker in either direction - the wheel stiffens up. I believe this is a hydraulic issue.

Upon further inspection I found that the hoses leading from the oil control valve to the orbital (I am assuming the oil supply hose [listed in Toyota's service manual as the "T" valve on the orbital]) were torn as well as the supply hose was constructed of normal coolant hose, not hydraulic hose. I have since ordered the replacement HYDRAULIC hoses and am awaiting delivery.

My hypothesis, is that the non-hydraulic hose on the "T" valve of the orbital was choking the hydraulic pressure to the orbital, which would explain the smoother steering on the lower pressure scale and tough/choking steering on the higher pressure scale.