Zerging problem fixed. Don't allow us to engage Van unless towers are sufficiently razed. Just slap a gate on his keep that breaks apart further as each tower is burned. To counter endless matches with countless recaps, remove the gaining of reinforcements from the mines, and instead add raid-wide stat buffs for each mine controlled making them an important resource to cap.
Bonus side effects would be bringing back the importance of collecting quest items from the battlefield to help make our push across the map easier. Hey maybe we'd even see the giants summoned again for fun.