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PRH said
Here a pic of a Comp Pro Magnum:

What you can’t see in this pic is there is also a spring relief cast into the body.

View attachment 1715308996

Notice the difference in the relationship between the adjuster cup and the roller tip between the two rockers.
The PRW rocker has the roller higher up vs the center of the shaft, so the rocker has to be rotated down farther for the tip to contact the valve, which results in the contact with the retainer.

Tnx. And it looks like the PRW's adjuster sets lower relative to the centerline of the shaft, if you imagine where a line perpendicular to the adjuster axis intersects centerline of the shaft. (My 1st impression would be that there is more motion lost on both sides of the PRW, but that needs more thinking out.....)