I know with my pipe the going gets tough through the swingarm, I softened my rear spring preload the other day as we where going to bumpy teritory.
I noticed that the right hand side has a very slight mark on the pipe where it has rubbed, the rear did bottom out a coupla times and I suspect this is when it did it as the normal travel is fine although there is FA room left when the wheel is at full compression.
There is another way of doing it as pictured below, not as pretty IMO.