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It's fine, the derailleur is doing enough tensioning to keep it on but the BB is longer than i'd like so it's a bit noisy which doesn't help that.
The cup of the appropriate sized BB i've got is threaded and I'm trying to find a new one so with the right chainline I think it will be perfect; I'd just be careful with making sure the chain is the right size as even an extra link can make the difference.
How's the singlering setup working out for you? I am thinking about doing that to my current roadbike as I am downgrading parts on it. But fearing chain will drop a lot...