I think you are right on with the stainless sleeve. The wear is normally not apparent to the naked eye. Just a couple thoughts. I know you have probably checked this...but there is not anything like a broken screen or something in your inlet impeding water input? Also, I know on a couple merc/mariners I have owned, the tell tale is after the thermostat. Meaning that until my thermostat opened I got little to no output. As the thermostat opened I got a good hard stream. You could actually see the stat working as the stream would psi up then down. In the hot summer it didn't take long and would really never ease up...but you could watch it in the cool weather. If by chance your thermostat wasn't working up to snuff...and your engine was plumbed this way...you would get the impression of the pump not pumping as it should. Probably not the case but thought I would throw it out there. Hope you get it figured out!! Nothing worse that losing that piece of mind on a thing like cooling or oiling.
"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15
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