bent rotor contact blade

If you mean the blade attached to the rotor that rides on the coil contact inside the distributor cap; wow, never heard of that happening.

To start, I think you need to replace the cap, rotor and condenser with high quality parts and go from there. Is there evidence of the rotor tip coming in contact with the distributor contacts?

There is about a 4 page long article at slantsix.org where a guy tested and measured various combinations of rotors and caps. He didn't look at just one cap/rotor combination but checked multiple parts from the same manufacturer sourced from all across the states. He actually cut windows in caps and measured running clearances etc. What I mostly took from that article was there is a lot of bad parts out there and used the info to choose parts when I rebuilt my slant.