I dropped all of my troops near the center of the unbroken wall as far back as possible. I dropped them in the order that they are displayed, left to right. Doing it this way, my bomber was left idle until I just decided to use it on a turret instead of the hero AT. The snipers took him out.
After a lot of times trying previously, I came here to get some intel on what works. The consensus is that you drop all of the troops at once, not in waves. I was noticing that my best success was from the solid wall. I combined the consensus here with the solid wall success I was experiencing, and the next thing I know was 3 stars.
Of course the programmers could be monkeying with it or have built in some limited randomization, but the blitz attack does seem to be the solution.
Now, if only I could solve these expert level 5-house puzzles in Microsoft Sudoku!!!