BFL13 Reasonable analysis for warmer temps but designs should include lower temps which raise panel power. Interesting that you didn't again bring up lens or cloud effect. I agree that it's likey a panel CB fault which can be eliminated as it serves no purpose.
For general estimating purposes I use 66% of panel power for 4+ hours. On a clear hot Phoenix sky in June I pushed my loads and got 53A from the controller with 750W panels. But I designed for for cold temps as well.
And it seems likely the OPs 2 problems are unrelated but w/o details who knows?
OP Recommend you replace both CBs with better quality ones if not eliminate the panel CB. Then see if you repro the issues.
