I saw a couple things you guys could improve on.
You're gonna want to stack HBDs if you're playing Elim Pro with no nades on, since that slot should always be utilized in every game type. It's not too expensive to buy the lower-end HBS, if I remember correctly.
On Bravo you should post up only one guy in the top left tunnel, because that's pretty easy to defend on your own. One guy should be HBSing the underground area and the right side entrance (nobody should go down unless something shows up on the sensor), and the other two should post up in the main room ready for an entrance on the right side.
On Alpha, you should start the round by blowing up the barrel in front of the base to make it so all the other team gets funneled into the right entrance. HBS the right entrance through the wall, put another HBS in the corner by the stairs, and split your defense in the main room with one aiming towards the front and the other aiming underground.
Other that that if you're playing a decent team, push until you get an advantage and then camp, because that'll force them to come to you. This team was pretty sad, so I don't blame you guys for not doing that in this case.
Gratz on the win otherwise.