i think one of the things i like about storyboarding for comics, especially as a stream-of-consciousness process, is that all you really need is a vague idea of where things should go, and if you have that, you can roll with the little surprises that change things up.
stuff will probably not quite gel with you later, and that's probably for the best, as you're spending time both processing visual and narrative coherency like, off the cuff. but it's GREAT because having the structure sparks new ideas. you can get a gut response from yourself.
it's honestly just better to power through and read it later and do a small post-mortem on yourself to see what it is you like and what you wanna change, and go into the next draft with the big picture in mind, rather than focusing on all the little changes and tweaks.