I did. NGK CM6. You're right. I've had the stock plug actually fall apart in my DLEs before. I also have the newer ignition that supports upto 8.4v and the beam mount kit for the DLE20.

I have a few of the RCExel opto kill module but never lasted long for me. Eventually they start killing the ignition by themselves so I don't use'em anymore.

Now, granted, I'm a bit ham-fisted but I was shocked how brittle that piston ring was. It may have something to do with fact that I had that motor spinning a 13X9 3blade at 10,500 RPM WOT on the BF110.