You wouldn't be after you saw the maintenance bills.
There's a lot of things it could be. Initial speculation is always wrong.
PS: 310 fuel system isn't hard. Just remember the tip tanks are the mains and the fuel return system pumps fuel back to them, so you need to burn off fuel from those tanks before you try to use the aux (wing) tanks. I always ended up running the aux tanks dry by plan, usually ending up with an engine out for a moment followed by a nice yaw as I switched back to the mains...exciting for anyone with me...!
I figured it could have been like with a lot of airplanes and it might have owned you as much as you owned it.
And if not, well...then I'm even a bit more jealous...but in a good way, of course.
So maybe it's not hard, but I see what you mean about how you have to fly it. And I think it would a serious challenge to catch back up to a 310, especially if you weren't current.