I have seen alot of good comments on Belray MC1. Most use it at 50/1 and a few at 65/1. As for your altitude I don't think it has too much effect on your oil mix. I could see going a little richer (40/1) at extreme altitudes due to the lean fuel to air mixture, but not for 4,400 feet. PE or RCign could tell you for sure. I believe RCign is at about 6,000 feet.