Its not been brought up yet, but even for a mild roller the prw-s are what I consider the poor mans HS, as mentioned swap out the adjusters.
But what has not been mentioned here is although the T bearing used in the prw-s have if I recall 4 less rollers in there T style needle bearing ITS a direct cross ref part number to the same bearings used in the HS rockers.
So there then the possible quality of the al used and the fact they are not as wide, here again I see them as the HS on the cheap and do know of several sets in use with no problems in the 550-600 open area, NOT in the 700-750 area.
http://www.wholesalebearing.com/nrcagetype.html HS has the INA SCE 146, PRW IKO BA 146 Same specs, interchangable if needed.
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