Maybe that's because Starfleet focused on shield technology, while the Klingons focused more on Weapon technology.
But then wouldn't that mean that the Federation was destroying less ships, than the Domonion?
I don't know if the effect was on purpose, or there wasn't enough screen time or budget money, but it was never shown.
In all the major Domonion battles you don't see it.
The Fleet battle in SOA was one the best space battles I've ever seen.
They showed almost everything-the Fed fighters, fleet formations, tactics. Even the Klingons showing up at the nick of time.
Perfect blend of story telling and special effects.