Don't think i'd really want to attempt a loop in one either, they don't strike me as being anything like an aerobatically capable aircraft.
What sort of degree of bank would they start to exhibit that characteristic from? and also what are their general flying characteristics? as i have been told they're generally pretty docile apart from the excess bank issue, and Vmax is somewhere around 80ish knots.
Mine still has an electric start EC44PM, though as it sat in a museum since around 1997, and hasn't flown since around that time and quite likely not run since that time either, it'll likely be updated to a 503 or similar.