Are you by any change using highlight brilliance in “color balance RGB”? There’s a known problem when you use more than ~20%, and that problem shows up when using highlight reconstriction in filmic with just the kind of “explosions” you see.
Nope, filmic only shows the problem, it’s produced by the brilliance setting. You may want to check out Github issue @Donatzsky linked to (but do read the whole issue, not just the first few posts…)
Don’t like filmic, then try sigmoid. Sigmoid has become my default because of the results I get out of the box. I am not criticizing filmic, but it requires more effort.