I'm been running Amsoil Injector oil for several seasons. With Yamalube and stock settings, my 500's were at about 80mpq. I've got them both up to 175mpq safely (during hard riding with some powder play) and have less smoke too.
The Amsoil race oil should be used only for WFO conditions, idling might be a bad thing, since it's beefed up a little.
The new Interceptor, I've heard good things about it, it's a little more than Injector oil though. If I had sleds with power valves, I'd run Injector oil, and tune that oil pump for the oil. My SRX buddies who run it have had zero problems doing it just like that.
I've heard great things about Redline and Klotz, but availability and cost pushed me toward Amsoil. I am running it in pretty much all my internal combustion engines!