Don't expect too much from the upgrade. I have progressive springs at the front and Ohlins at the rear on an R100GS PD. It's still extremely primitive. I did also have thicker oil in the forks, but that didn't seem to make any difference. Have since been advised not to do that, as it's not so good for the seals. The Ohlins helps a little, but I still make sure I don't overload the back with weight (i'm a bit heavy anyway).
To put it into perspective, I travel with a friend who has an R1100GS with the paralever. He is able to ride tight twisty roads much faster than me. Where the R100 is diving, drifting wide and becoming unstable, he is able to go fast, using the brakes in the corners.
More important has been fork maintenance. Have an expert do it and make sure everything is tight as specified, that makes a big difference to stability. I don't get the bars wobbling and threatening a tank slapper anymore.
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