No, not much difference from 160 to 320 to 600gph pumps, but then I was using pumps that dispersed a lot of heat into the water, which the Iwaki's don't. ie. what benefit I was seeing from higher flow rates was being overwhelmed due to the warmer water temps from the hotter stronger pumps.
The Iwaki's disperse most of their motor heat into the air. If there was any high flow/head pump that I'd recommend above something like an Eheim 1250, then the Iwaki MD20-RZ (note the Z - referring to the high pressure head model) would be the one.
You'd gain about 1C or so by using one on a hot CPU under full load.
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