Ive used all sorts on all sorts of bikes(incl R1,Blade,GSXR thou & others)so yes,i have tried modern rubber and true,sports tyres have moved on...but so have sports touring tyres...
Sticky sports rubber is fine on a powerful modern sports bike used on track days/very hard road use-with ,of course,a rider that can use them to the full(very few of those around...
)...but on a big heavy sports tourer like the Blackbird? Nah,youre wasting your money...
But,like you said,fit whatever you feel comfortable with. . .and dont take too much notice of what they write in MCN...!
BTW,you get 2-3000 miles out of a rear tyre? You sure youre not using touring tyres. . . ???