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The sluggishness is no surprise given what you are working with.
I am pretty sure you have excessive stagger that has significantly altered the front end geometry by making the front much higher than the rear in relative terms.
The rear spring on your Ohlins is quite soft, almost 200 # / inch lighter than stock. Combine that with the terrible stiction of the stock shock, and your nice smooth Ohlins unit with lighter spring will have the rear ride height lower than before.
At the front, the 1.0 springs are very stiff and will have raised up the front.
You could easily have 7 - 10 mm of stagger (e.g front up 5 rear down 3 = mm stagger).
Your 0.925s will help, and suggested is 15 mm of internal preload and not any more. Later you could even try 10.
Suggested is setting up your Free Sag at 5 mm and then just measure the Rider Sag so you know what it is. Less than 5 mm of free sag is inadequate, and while more is nice, it will lower the rear ride height. If one wants to be able to get 10 mm of free sag, and a decent rear ride height, a 1100 -1200 #/inch spring is needed as well as a length adjustable shock.
I'll post pics after it's on.
