Frenzy help!

     I got stuck in wave 17-18 for the last couple of frenzies. All the Zs have higher hp after wave 13-14(?) and it is hard to take them out with my rare lvl30s Ac20, MG7.62 and uncommon lvl20 HCAN90. I have arrange for some chokepoints too but it got overwhelm by lvl15. So should i wait until i hit rank 30 and unlock all my defenses and barrier or keep upgrading my weapons to get past lvl30? 

(Base layout 👇)
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