My 900 CPU runs ultra cool (105º F normal use) by using both a PCMCIA card cooler fan and a USB 3 fan cooler base, so there's no motivation for me to experiment further.
I also used Artic Silver's Cermanique compound, and my running temps have actually dropped even lower after the compound has set. It's 100% non-conductive and one of the highest rated compounds available.
Could you test what your CPU temp is with just the USB 3-fan cooler base and the Artic Silver compound?
I already have a USB-powered 3-fan cooling base, but I haven't been able to find a PCMCIA card fan here in the states from a reliable online store. I'd also like to keep my PCMCIA card slot open for USB 2.0, Firewire, and memory card adapters.
I'd like to keep my CPU temps in the 100-125 range without resorting to a PCMCIA card fan.