''clean all of my electrical contacts between the battery and spark plugs''. That would be a h*** of a job.
You said the spark plugs/distributor cap/rotors are due for replacement. Before spending any other $$, I would do it.
I would also forget about the OVP. Those poor OVP's seemed to be blamed here for all sins of the world.
Get your ignition in top shape first (you said it needed it). If the problem is not resolved, get to the fuel system (filter, accumulator, pump).
I don't think what you described about your plug wires is the cause of your problem.