With RsrvCold/RsrvWarm I get constant reboots?
RsrvCold usually works in most cases, for special cases try the -f,r,s,o options which reserves the required memory for MacOS to work in different places or different sizes. Read the Fusion documentation for these switches. Also, Fusion requires a large amount of contiguous RAM to run in, so try a dual-boot method so that Fusion loads without Workbench (and other programs loaded) to maximise memory for Fusion.
