I'll vote when I tried more different tyres. Tend to stick to what works. I only used Diablos after std 020's. Didn't like 020's. Like Diablos, more grip, much more predictable & progressive, wear v. even across tread f & r. Mostly sports riding. Gonna trysomething with a more triangulated rear profile next, Michellins or maybe Avons? - I used 170 Diablo (5.5" rim) - improved turn-in massively but concerned it may run off tread on stretched profile, went back to 180 (Still prefer handling on 170). Get 2,500- 3,000 miles on Diablos, had 3,300 on 020's (by then they were v.unpleasant).
I use Guzzi handbook rec'd pressures. Works well. Tyre manuf seem to rec'd higher but feel too hard to me.
KB