On the power spread thing, IMO anyone who thinks any twin has a wider power spread than a modern I-4 hyper sports 1000 is dreaming. That GSX-R I rode was pulling really hard at 4500, and at 12,000 I think it was still short of the power peak. They make good power to 14,000 or therabouts. 6-7K is just the lower end of the midrange and they sure r hauling there.
What they do lack compared with low-revving twins at the low-end is throttle response. Because they run huge throttle bodies, you feel less of a kick when u open them up under 5K. But that doesn't mean they're not pulling there. Line up your torquer twin beside one and you'd soon find that out.
I don't flatter myself that my Superbike engined Ducati with a stock 115rwhp has more go at 4K than a GSX-R1000 with a stock 160rwhp. Having stepped off one and onto the other, that I-4 had way more there.
Sorting out the S4Rs Ohlins shock: click here