Points loosening is not the fault of the left helical, but of the sloppy fit of the threads. I use right wing and my points all loosen up. Some a couple of turns on every shot. A little string wax on the threads will help keep ' em in place.

Unless you' re shooting a selfbow off your knuckle, then helical direction doesn' t make any difference. Left helical will take the leading end of the bottom hen feather off a right handed shooter' s knuckle, so it won' t cut the hand as it passes. If you' re shooting off the shelf it' s not a huge concern. Off an elevated rest and it' s no concern at all.

But, then... There' s that Coriolis effect that might come into play here... Where' s a physicist when you need one?