For ranged units & mechs CD is definately the way to go but you can remove layers.
These are a few months old but it gives you a general idea.
http://www.evonyurl.com/2rgax0
http://www.evonyurl.com/xq3xcp
You can do the same by clearing all the layers when facing a mech wave. I do, however recommend if you do that load your city up with scouts. You'll need 15k ballista at least to repel a mech wave.
This was my first mech wave defense. Hopefully you'll spot the mistakes I made.
http://www.evonyurl.com/pkcevb


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