Back to the original questions, I wouldn't fly too far under 9.6v. As far as your radio is concerned, I would have it checked out. Given the other posts on here, we know the radio does load testing while on. How much load I don't know. But if it's reading 8.8 and you're Hobbico meter shows 10.14, that is a huge discrepancy. Both can't be right. I would err on the side of caution.

I would say you could just keep flying and check the battery manually. But even at 10v on the Hobbico tester, the TX will probably think the pack is so low it will just start beeping non-stop due to the low battery warning. If you have a flying buddy close by with another load tester you could doublecheck the results of the Hobbico meter.

When I get home tonight from work (3 am), I'll pull the battery from my 7C and run a load test on it, then see what the TX LCD says.