We seen these threads over and over. They didn’t nerf Classic compared to Vanilla. Classic is way more challenging than Retail. This was brought up many times and Blizzard made sure to check and recheck to make sure everything was right and it is.
The damage from mobs in Vanilla are the exact same in Classic. If you want the mobs to be harder than Vanilla for even a harder challenge which is what you are asking for. I say no. I am in with the #Nochanges.
Classic is pretty authentic. Blizzard did the best job they could and it shows.