To make the mission more like a real delaying action you can adjust the value and position of all of the victory hexes during your support units purchase by going into the view map screen.
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Double tap, Dash, Down, Crawl, Observe, Locate the Enemy and Return Fire.
I played some WBW scens in SPWAW with VHs that had points based on turns held. You had to decide between losing troops to hold the hex and losing the points per turn.
Great stuff.
Is this possible with MBT/WW2?
I think of advance vs delay battles as hasty attacks vs hasty defense battles.
A hasty defense requires the defender to balance losses, terrain and time. As time (nr of turns) is fixed for a battle, that leaves balancing losses and terrain. Seems like you gave away too much terrain too soon...