Not an expert, but I'm willing to brainstorm with you a little.
I had the 4.3 in an S-10. Did the the same thing. I had to flush out the heater core with the hose and that fixed it. All kinds of gunk came out. Sounds like you did that. It might be worth another shot.
I also had an issue with an intake manifold gasket. I can't tell you exactly what it was, but I was losing coolant into the oil pan.
Is it possible the belt or tensioner isn't quite working like it should? If there is slack, maybe the water pump isn't turning quite like it should? Just a thought and something I would look at if it were mine.
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