I don't see why you're getting so hung up on pass thoughs, but if you have to have them, try heavier bullets.
Sounds like you got some great bullet performance. I've found the 160gr 7mm and 180gr .308 Accubonds will pass through elk on broadside shots.
Most guys that want pass thoughs 100% of the time on elk shoot 200gr bullets, btw. And even then, they don't get pass thoughs all of the time.
