Some thoughts on this, ignoring the under-tuned numbers / Living Bomb situation for now:
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General playstyle is actually pretty fun, with a lot of instant casts, procs, and mobility, particularly if you don’t mind SKB/Ice Floes. Can feel very frenetic at times, with so many things lighting up at once, but that seems like the goal here.
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Frostfire Empowerment can stack twice, which is generally pretty nice, but Excess Frost/Fire only stack once, which means you have to be really careful about proc munching. If FE is up and Excess Frost/Fire are also up, you need to spend the latter ASAP before you cast FFB or you completely waste the existing Excess procs. This can make it really hard to line things up with / save charges for Combust/SKB since you’re basically locked out of your filler until you use the procs. Luckily you’re rarely out of charges but it it’s pretty counterintuitive to the spec as a whole.
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On munching, oh boy do you munch SKB stacks with the sheer amount of procs you often have to spend before you can hard cast a Pyro. This gets even more wild if you take Heat Shimmer. Would be great if these SKB stacked above 10 but even then I fear it would be tough to spend everything.
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With the sheer volume of Excess Fire/Lit Fuse procs you’re generating (and I took zero LB talents, including Lit Fuse itself), I really don’t see a way to balance Living Bomb as an option for Sunfury (or overall) if it remains this tied to Frostfire. In the spirit of not pigeonholing FF into the LB spec (with Sunfury being our ST spec), I would really not mind if Excess Fire did something different for Fire. (I dunno, shoot out a few Ice Lances or something?)
Like, it makes sense that Excess Fire would give Frost a Living Bomb on their next Ice Lance, since that’s just a freebie they can’t talent for, but for Fire this proc is intrinsically tied to an entire side of our tree, which is kind of problematic.