cryzer dont do that. get firerate to 150 and rest to damage. none to range. that is the best. dont listen to people that say use colors. use two white.
get fire rate to 150. everything else to damage. use only two whites. it is stronger than one of each color. i tried one of each color upgraded equally and i lost like 5000 lvls.
All of mine were equak with the rest pumped into the white tower. I make mine with two side by side equal and rest pumped into third until i can upgrade one of the main two. For some reason it works better for me. Who knows maybe i screwed your setup up.
http://tinypic.com/view.php?pic=1zzp7cw&s=5
That is my setup. I add all money to tower showing and one to the right. This has worked much better for me measure.
Measure i tried your maze and i lost like a 1000 lvls. All whites upgrading just 2 of them and putting money into thiird until you can upgrade main is way better.