I installed Progressive brand springs on my '81 R65 in 2007 .
Helped a lot .
I don't know about all brands available, but the Progressive brand springs are shorter than the OEM springs and a PVC spacer is put in on top of the spring during installation .
One unusual thing about these springs, I get a squeak from the forks when I leave my driveway and go down a curb, only time I hear it .
Also on rebuilding the forks, there is a difference in the amount of oil used whether you just drain and refill the fork oil, or completely disassemble them .
Can't remember what the difference was, don't know if it would make any real difference in the forks performance .
I used the BMW branded 7.5w fork oil up until a few years ago, no longer available from the dealer, so I'm using 10w oil now .
When I rebuilt the forks 15 years ago, I put gaiters on the forks, looked odd at first, but now it seems ' normal ' to me !!!!!