I like the concept of 3 types of atomic breath.
Quick burst, stun style where it can disrupt an opponents attack...minor damage but buys time
Normal blast, similar to the waterfront scene in G85, longer beam path and more powerful, substantial damage to monster opponent if hit.
Last resort, a full power blast where maybe Godzilla inhales and exhales to the point blue energy can be seen exiting his mouth then drawing back in, dorsals light to the point they no longer flicker but are solid white/blue and the burst is explosively destructive. To do this though weakens Godzilla for a period of time or exposes him to the destructive effects of his own blast for a period.
I never understood why people want variations of his beam. I'm good with just a standard heat ray, I wouldn't expect to see anything like the spiral ray.
Also, that brings me to another point, does anyone remember how a bunch of people wanted Godzilla to be weakened the more he used his beam? I remember more than once that was brought up when this movie was just a rumor.