distributer cap mods?

Is there anything a guy can do to a distributer cap to make it last a little longer? Is it ok to drill a little larger hole on the top to let more air escape?
I have a crane cams hi-6 cd ignition with a crane cams lx91 coil and i'm running a mopar performance distributer, the cap i have is a Wells gold with copper inserts and the contacts become corroded very quickly withing about a month to a month and a half. I know i need to get better plug wires, currently have stock replacement 7mm wires and i'm sure a good 8.5mm wire with a lower reistance will help keep my caps lasting longer, i'm also running the special echlin rotor with the longer rotor segment to try and help keep the cap lasting longer.
It's just once the cap gets bad enough inside i start getting a stumble and hesistation and i tore apart my carburetor looking for the issue when it was the distributer cap the entire time.
I'm thinking about just drilling a larger hole in the cap to allow some air to escape out of there, i have my plugs gapped at .045 inch currently running champions rc12yc plugs.