Awesome. I feel stupid now as I actually did read that, but missed the part that says:
It is extremely important to use disk labels when working with iSCSI storage. Delays in network traffic may cause the LUNs to be discovered in a different order the next time the system is booted. The only way to guarantee that the correct partition will be mounted at the proper mount point is to use disk labels to identify them.
Oh well, guess it was too easy - forest for the trees and all that.
Also, re: WB caching, I will crank it all up then, I guess. Now I just have to start tweaking to improve the read speeds.