I got to wave 26 before I ran out of time to play today, but build worked fine, just slow. There is SO MANY SUPER WYVERNS!!! And they don't really get close to the crystals, but they take a hot minute to kill them all.
Basic build dilema is there are 3-centers to defend, and they are not close enough to each other to combined defense and gain advantage from Tower Boost, so they have to stand on their own. If we could find a way to safely ignore one or tow of the crystals (with just some auras there, that would be a step in the right direction. We gain some advantage from the owl nests, but they don't seem to have the range to cover the whoile map (maybe a personal stats issue)...maybe we swap for LTs??? Also Super Wyverns have very high health and for the most part we are doing dmg ticks, so cloud towers may be a better play, I don't think I can drop the slow auras which is another speed killer.