Sanding the end of the rotor does work; however, I have found it better to use a small screwdriver and carefully & lightly scrape off the deposits on the distributor contacts. This way you don't run the risk of reshaping the surfaces of the contacts.

I don't understand your term "silicone" plug wires. The best wires I have used are the ones with solid copper wire inside. They can last just about forever. If you have these, chances are your plug connectors are the culprit. I'm still using my original wires, but with new connectors. MBZ plug connectors come with resistors. This is why non-resistor plugs should be used to avoid compounding the resistence. I have had good results with NGK non-resistence plugs, as have the other guys.

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Don't Chrome them; polish them