Here's my comparison of ammo/health of ashville/viaduct/lakeside (doing from memory, correct if wrong), and my proposal for pro sandstone's ammo/health:
ASHVILLE | AMMO/HEALTH: 290/250
AMMO: 2 medium, 1 mini, 1 medium @ mid
HEALTH: 2 medium, 1 medium @ mid
LAKESIDE | AMMO/HEALTH: 280/241
AMMO: 2 mini, 1 medium, 1 large @ mid
HEALTH: 1 mini, 1 medium, 1 large @ mid
VIADUCT | AMMO/HEALTH: 250/220.5
AMMO: 2 medium, 1 medium @ mid
HEALTH: 2 medium, 1 mini @ mid
SANDSTONE | AMMO/HEALTH: 270/223.0
AMMO: 2 medium, 1 mini @ mid, 1 medium @ mid
HEALTH: 2 mini, 1 medium, 2 mini @ mid