[Coloradocurt]

I note in your thread that you mention having a muscle car background, so that could be a source of the problem (either in your situation, or more generally with many 911/915 drivers). Detroit muscle car floor-mounted stick shifts are intended for the driver to just grab the shift knob and "yank" it into the next gear (such as in drag racing). Over multiple decades of driving 915-equipped 911's I've never needed to overhaul the tranny, and I attribute that to a shifting style taught to me. Rather then maintaining a constant amount of force on the shift knob through the entire motion, I just reduce that pressure slightly as I pass through neutral (and to this day I use that motion even on my slick-shifting Honda Civic Si and S2000).
I also agree about trying the Swepco 201.