You'll never get balance because changing even a single little number goes against vanilla.
What you can do however if class balance isn't something that should be considered is figure out in which patch your class was the strongest and argue for that patch to be the one that Blizzard use for Classic. I'm sure there was a patch during the life span of vanilla where rogues and warriors were shit, if you don't want them to dominate everything in Classic, ask for another patch.
Or you know we could just use the best working version of vanilla (1.12) and actually do some changes like nerf the overpowered classes. You get my point? Classes changed A LOT during vanilla, if you won't accept any balance changes you'll have to accept that your class might be an unplayable piece of crap because of the version the community chose to go with.