I say bring it on.
The last time I had a sup ride my ass about SPORH, I told him I would commit to whatever number he was able to demonstrate to me.
He got on car with me the next day and took the drivers seat. I had a notebook of my own, and I started timing him with my wristwatch and documenting the flaws in his methods. I would talk to him and recite numbers in order to confuse and distract him while he was trying to concentrate on looking for addresses and finding his next stop. I pointed out to him whenever he failed to select a package in under 24 seconds, or whenever he took longer than 7.5 seconds to stop, secure the vehicle and open the bulkhead door. I kept a running total of hs SPORH and reminded him of it every few minutes to keep the pressure on. I documented and verbally confronted him every time he failed to use a proper safety method, or whenever he followed another vehicle too closely, or failed to curb his wheels when parking on a hill. After 3 hours of this he didnt know whether to shiite or go blind, and his SPORH was nowhere near what he expected from me. We wound up needing help from other drivers just to get our pickups done on time. He learned his lesson and never bothered me again.
If you are being harrassed by a sup over SPORH, all you need to do is turn his own tactics against him. Insist that he demonstrate to you what he expects from you, and when he tries to do so you can break him down and drive home the fact that he is totally incapable of doing the job as well as you can and that his expectations are not based in reality. He will then leave you alone and seek an easier target. Never lose sight of the fact that when push comes to shove you can ALWAYS make your management more miserable than they can make you. Its all a state of mind.