those turn downs always made me nervous. They don’t cause reversion issues?

Should not be anymore of a concern with what you have now. The water exiting the exhaust into open air is the same height above the water level. So open air or exhaust filled tube going out a few inches then down another 10 to 12 inches

Installed +3 inch higher exhaust after repower because of cam, and that was maybe 3 years ago, and no issues