I’ve got some low friction seals but haven’t fitted them yet, ill fit them when i do a lower leg service and see if it makes much difference.
I’d definitely recommend the charger damper, makes the forks a lot smoother and sit higher in their travel, i found the Boxxer rcs to feel quite wooden, long runs would knacker my arms quite badly and the charger stopped that happening. I found it a very obvious improvement. I just find i can still only get about 20% sag even using the softest spring hence thinking the air spring may be worth a shot.
I got the charger kit from bike-discount.de a few months ago and it was a good deal cheaper than anywhere else i found it.