Those forks do have a lot of stiction. Most of the time its caused by the seals. And shimming the bushing helps a lot.
But thats a lot of work. And give the bike some more sag to give the inner en outer tubes more overlap.
Don't tighten the bottom triple bolts to much.
The SKF seals are an enormous difference. But they are expensive compared to others.
For your fork they have 2 types. One of them is a set with tighter dust seals.(for wet conditions) and give more stiction again.
BMW R100'91/R80'93/R75/6 R80ST'83/R65GS'87/GasGasTXT300/DouglasW20-1920