Hint 1: I usually use two owls under the mushroom and golem, but 2 DSTs in the LT stack should work fine too.
Hint 2: I use the Pylon as a jump up to top of golem for nice vantage to do Tower Boost Monk. Upgrader goes next to Tower Boost Monk to feed Mana for Upgrading
Hint 3: At least 1 boost summoner and whatever builder you want in for extra dmg boost for the tower type.
I tend to do 2 boost summoners and warden, but that's when I solo. As long as I keep tower boost up, I can typically carry a pub through 35.