NEVER too late to switch. I changed over my UC in Feb '07 with 58,108 on the clock. Had SYN3 in it when I bought it, and I used only HD360. After my cam chain tensioner shoe nuked, I started investigating engine oils. Switched to M1 vTwin 20W50.
Was running the HD tranny lube in the transmission until it started leaking oil (Chop, have you sorted where that was coming from?). Have ONLY run Spectro Heavy Duty Platinum 6-speed Transmission Oil in the SE 6-spd that I replaced the OEM 5-spd with.
I run Spectro Heavy Duty Primary Chaincase Oil in the primary.
TQ