In "Call to Arms", it's UNAMBIGUOUSLY established that starfleet shields can stop dominion weaponry efficiently.
Only that they can withstand it significantly better than before. Which may still only tell of a partial reversal of technological imbalance. It's not as if "Jem'Hadar" unambiguously established that the shields would have been having no effect at all against the enemy weapons, either; we're probably talking about grades and shades here.
(One wonders if the weapon effectiveness in "Jem'Hadar" really was due to a strong imbalance. Perhaps it was just a psychological trick, accomplished by having a saboteur aboard the Odyssey
who informed the attackers of shield frequencies or weakened the shields?)