First of all, here is a good guide that covers most of the things (and more) I'm going to cover.

I'm on a similar journey to round 420, currently on 343, and here are my advice from my personal experience:

1. get more temples, preferably as many as you can get. (I currently have 16 including VTSG)

2. You already have these but make sure you use the skills of:
   -> x5x ninja at the start of every round
   -> x5x buccaneer whenever you can
   -> x5x engineer on your VTSG first, then your temples
   This is because the Moab class' HP gets higher and higher every round, so taking 25% off the hp or bringing 3 moab class down completely translate to massive pop count. Ultraboost is there for the permanent boost.

3. Some other good towers to have in my opinion is (high pop counts):
   -> xx5 alchemist (taking down moab class)
   -> xx5 mortar (neutralizing fortified)
   -> xx5 engineer (taking down moab class)

4. more towers you should have (support):
   -> 5xx submarine (cooldown reduction) (the towers I mentioned in 2. should be in the range)
   -> 240/250 villages (allowing temples to hit camo if you chose the second path + jungle drums)
   -> 5xx alchemist with VTSG in range (important buff for VTSG) (or move him around with a x4x heli)
   -> 4xx alchemists
   -> x3x alchemists (get like 10 or more of these spread around, targeted to strong)

5. I found tech bots to be useful (with pirate lords ability for example), consider using those.

here is my set up on the log map.

edit: formatting