What could be a lithe, nimble, bit of kit, will now handle like a water buffalo!

Shame.
I was out on the SRX Mono last night and with a 110/70R17 Avon RoadRider on the front and an Avon RoadRider 140/70R17 on the rear and when compared with the 3.00 x 18 Hiedenau on the front and a 3.50 x18 on the rear of the Duke it is like chalk and cheese. The suspension on the Mono is plush when compared with the Duke; but the Duke just needs thought to go through a corner, whilst the Mono needs body input. But then a 4.10 x 18 was a big rear tyre in the day!

If you wish to purchase those Firestone tyres, here's a link below. The prices are eye watering and the maximum speed rating is 93mph! Note the motorcycles listed as it being suitable fitment for, includes a Z1000 and a Ducati 860GTS.
Firestone-mc-deluxe-champion-universal-400-18_tyreRoad surfaces up here are getting pretty dire and so the Duke front end has been tweaked today, with thinner fork oil and less preload on the emulators and a bit more pre-load on the Hagon rears, as the tyre has been whacking the rear mudguard and I'm only 90Kg fully suited and booted!

What the results will be I will see tomorrow.
Good health, Bill