Those anit-rotation things are bumps, not divots. When I looked at the photos the OP uploaded, I thought they were divot witness marks, but that could be an optical illusion.
OP - are the bump outs or divots (witness marks).
If divots (witness marks), I think it doesn't have anything to do with the return spring. It think it is to much force being applied at a weird angle when the clutch pedal is pressed.
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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