Southern Son offers good advice. That is not the first time I've heard of the woes of those air operated gasket surface cleaning products. I have a simple scraper that uses a single edge razor blade. It's a little time consuming but does a very good job without introducing grit into the engine.

I'm not surprised about your cylinder walls. That's a good sign. My biggest worry now continues to be your oil pressure. This brings up further thoughts. When you fished out the timing chain pieces were they very dry? With low or near zero oil pressure, this could be related to the chain failure. As others have advised, analyze everything until you find the source of your oil pressure loss. It's common for everyone to replace the oil pump when pressure is low, but it sounds like you already know that the problem is most likely elsewhere.

Thanks for the minute by minute reports and good luck,