Update after I have run few hundred kilometres with new Hyperpro spring.
I bought 919 with 15Tkm, with presume that shock should be still ok with that mileage on. I guess I was wrong? – I don’t know how new 919 rear shock should feel? Pretty soft, semi soft?
My goal with rep. shocks spring, was to stiffen the rear end of 919, not as far as RR style, but just a little harder than original; to still retain tour comfortness.
For solo riding, replacing just spring is ‘enough’. You can enjoy sporty ride. Guy with 70kg will not bump trough compression phase so easily, and rebound (fully closed) will stop fluctuation on high speed (>150kmh) wavy corner.
Riding with passenger on the other hand, needs harder compression and rebound than original shock can provide.Only harder spring wont't do it.
For guys descending from sport bikes, with lasting sport desires (and budget issues) – go for fully adjustable Wilbers or similar product + buy your self some wind protection