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Hi, I'm Mike G and I'll be assisting you. Are you making all connections to devices with the screws or the pushbacks?
You more than likely have open circuits caused by the use of pushbacks. Pushbscks always fail.
I don't understand your last reply. "Bd2515"
Twin breakers are independent except for their connection to the bus's. If the jaws are loose a bad connection produces heat which will trip the breaker, either or both poles.
I'm sure that it will.
Change of fixture should've matter. Do you have a 2 wire voltage tester?
Test a dead outlet as follows
1) hot to neutral
2) hot to ground
Let me know the results
When receptacles are like that they are usually split on 2 circuits. Is the bridge between the black screws cut?
Look at the black screws. If there is a black on one and a red on the other, the metal between them should be cut.
I'm sorry but I'm going to opt out. To troubleshoot a wiring problem takes more ability than I feel you have. I can't see that we will get to the end anytime soon.