Reflection beam is complely optional, used it cuz of spare 2 DU, could put a webwall somewhere if you so choose. Aura stacks are on the wall next the stairs. Seed bombers I make sure it can also reach the middle not just the corners to shoot. So if done correctly they can shoot ogres coming from the bushes to reach towers too. Same applies for the one aimed at the 2 crystals. They should be able to shoot down the middle too. Other than that I just use TB, 2 monk/hunt guard and 1 app/app guard. I have not tested this on pure strat but maybe it holds up. I also only go from 22-32 as end game drops dont mean anything to me. This build will work to 35 as tested. But I dont personally go to 35. The choice is yours. Make sure you boost auras onto buff beam at start of wave. I aim my TB monk far west spawn point at the fountain and it seems that it works. TB only tends to go down towards very end of round or for the first few waves it stays until end (this is with boulder thrower with 5k ranged damaged. Not tested with lower ranged damage but if hitting 2k damage to mobs probs fine)