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Excluding the extreme high and low speeds, PC speed recommendations often vary by the user. In other words, to some degree anyway- to each his own!
That said, we run our PCs between 4 and 4.5 for almost everything we do. We rely less on speed variations and more on pressure (or the lack thereof) and length of time, as a rule.
The only caveat I would offer when experimenting with PC speed is regarding abrasives. For most diminishing abrasives, the relationship between speed and abrasive "strength" is rather counterintuitive.... the abrasives tend to break down more quickly when you run the PC at high speeds; thus, you end up working with a somewhat less abrasive polish at high speeds. Likewise, the abrasives tend to break down more slowly when you run the PC at low speeds; thus, you end up working with a somewhat more abrasive polish at low speeds.
Either way, we still rarely find the need to move outside of the 4-4.5 speed range. I think most speed variations are fine.
-Heather
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