Not Ranked
It couldn't hurt to have a stronger pin but the pin shouldn't come into play, if it does that's because the fit of the gear over the shaft was too loose. The press fit of the gear on the shaft is the critical fit that prevents the gear from slipping, if it's not a tight press fit there will likely be problems sooner or later even with a stronger pin.
BTW, Comp Cam's hydraulic rollers are a material that works well with distributor gears. You could use the gear that comes on an MSD or you could add the steel gear, there's no need for anything exotic. It's solid roller cams made from alloy steel that are cause for concern, not a "hydraulic roller", at least not the Comp ones.
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