The key to winning in Wintergrasp is to get kills and starve the enemy of kills. The reason Offense fails to do that is twofold. We ride across the map and always trickle in to an enemy that easily gets there first, feeding them kills.
The second is the other “strat” is to try to flank SR and that puts you in direct damage of the base guns, which wreck havoc and feed kills as well.
In order to win at WG on Offense, from the start, Offense must ride to the bridge between SR and Eastpark and regroup before entering SR. SR is key, defense always goes there. I believe its practically that simple. We get our kills and split to BT to build while half, with tanks defend SR.
Just starve them of kills in the beginning.
As a counter strat for Defense, I would like to suggest NO ONE leave the base as an experiment to see what happens when you starve the Offense of kills.
If only people would cooperate with each other. The strategies are endless.