With most people at my local league hiding behind lots of blockers and high value support creatures (hourglass mutant, super machine dolzark, shadow moon, rikabous screwdriver) this deck taps and goes through blockers like a charm.

Its currently my favorite deck to use, and its highly consistent against anything I find at my local league except mono darkness decks using Photocide, Lord of the Wastes (just eats all my light cards). Otherwise I usually have complete control of the battle zone.

Draw is the only big issue im finding with this deck, I try to make up for it by having mist rias and dimension gate to find what I need.

Im wondering if putting water cards in might help but Im just not sure what to take out as I the mana acceleration is really helpful and the giant insects are needed to get ultra mantis out.

Any suggestions on how to improve this deck?

I like the build. Have you thought about scissor scarab? It's like valyrika for giant insects

Maybe test Sniper Mosquito.

With Mist Rias its Awesome, you can draw 1 and have still enough Mana to play something big like a Evo Creature or Holy Awe

And i would also add a 4th Bronze Arm Tribe. He is Awesome and helps to get out Mist Rias turn 4

Would consider to add some removal for the bigger ones (Bolly, ...) e.g. Natural Snare (or Vince Charger if you are brave enough) or against Rush.