You can use several fluids on the damper discs.
You can try CRC tube lube, crally damper syrup, regular shock fluid (replace often), losi hydra fluid and 1/8th offroad diff fluid.
Motion of the disc assembly can be improved with teflon tape on the discs and rear pod top plate.
I've never found the limiters to be very useful, but I'm really interested to hear how they work for you John!