What can I do, short of running premium all of the time, to eliminate the ping in my engine? Hotter plugs? Cooler plugs? Anything?

Higher octane gas. Add some sea foam to the oil and gas to help clean the insides up

i just run the higher gas and the ping stoped in mine

keeping your egr clean will also keep pinging to a minimum. I've just grown ignore my ping, as it's not all that bad or often.