Unbuffed destruction gives more matk, but when buffed in a raid with wedding food and hero madness gives you a higher matk.
You and i can be friends. You are the FIRST OTHER MAGE ive seen and talked to besides myself to see reason and get rid of your destruction runes instead of your madness runes. Everyone always looks at the "more mattk unbuffed" and doesn't look at the big picture of getting more mattk from buffing off an int rune when you need it most, in a buffed instance run.
also, regarding proof vs instance gear:
I am of an opposite mind as most of the comments will be here, in that, I too use hard mode instance sets. I can only assume the reason other mages go for proof sets is for the added crit. But with my gear for example, using full bethH set, full belaH set, and aoth set, plus my two crit "constant" buffs i get as a mage warrior, im right at 70% crit, which is (debatable by those who refuse to see reason lol) the recommended amount of crit a mage "needs." Especially a mage/warrior.
But let's not even get into that again