Thanks guys.
I find the grease that came out on the rear shaft is cleaner (just tan color) than front shaft @ 35k just an observation.
The other thing I notice in various greasing help threads, someone reported not seeing the rear shaft move after pumping a lot into the slip, when they posted a picture the drive shaft was sagging and already fairly extended, the reason it seems is they lifted their rear wheels off the ground, in that case, I think it is safer to avoid the "pump until it moves" method IMO
I did a conservative 3-5 pumps for the slip joints.