I have been following these threads as I am keen to also improve the handling of my MM. Yes, not quire parallel universe but we share the same forks. :)
The MM is a tall bike and I cannot say that I am tall, so the Wilburs lowering fork springs are attractive. They also do 2 for the F800GS as well - (part number: 600-0325-08 and 600-0326-04). I bought the ones for the MM and amazingly these springs are longer than the stock ones (left one is stock):
What is interesting is that while the BMW manual prescribe an air gap of 80mm, the Wilburs prescribed one of 175mm, more than double. The mechanic who installed the Wilburs mistakenly used 80mm and now the bike is higher than stock, and the front seems harsh. I will install the recommended gap of 175mm, and keep you posted on the outcome.
Sorry if I had hijacked the thread, but I thought you guys might be interested in this.