Glad the new O2 sensors are doing their thing. It's an incredibly common issue.
Speaking of common issues, so is the Code 43. I have that same code in my '95, and disabled it in the tune because it's irrelevant. The problem stems not from an actual problem with the knock sensor elements (that is, the ability for the knock sensors to do their job), but rather from the resistor GM added to them as a means to detect whether they were there or not. These resistors go bad or can be broken by rough handling, and when they do, they throw that code despite the sensors themselves continuing to work as normal. So my suggestion would just be to leave the code disabled and continue on. However, if you're concerned because the knock sensors you installed were new, you could always just test the resistance of your sensors to see if they're within spec. If they are, then yes, you have a wiring issue somewhere. If they aren't, then there's your problem, and disabling the code is all you really need to do.
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