I decided give Shell T6 a a go, and have some idea of what I was talking about.
Only had a chance to do about 40 miles. No slip. And I'm not certain, but compared to Yamaha Dino Oil that I had in there, T6 full synthetic pulls harder and just seems faster. Time will tell if I'm just rationalizing, but I like it.
I will remember this point that it's not always you get what you pay for. As cited many times already, motorcycle oils per se cost a lot more cash. Just like Shinkos, almost everyone was quick to say, you buy cheap, you get cheap. The cost is 1/2 that of the former Avons. Shinkos cost me 1/2 as much and gave me twice as much hook up.
Enough evidence for me to look for quality alone, not the price as the measure.
Jack