As with all carbs, the smaller the orifice the more attention it needs.
GL1200 carb bodies are the same overall "form factor" as the 80's V4 magnas and sabres, and like them have factory installed aluminum plugs preventing access to the air/fuel mixture screws (AKA Pilot needles). EPA!!!
As pertains to sentence #1, you can't do the job effectively without pulling the pilot needles and the bystart (choke) plungers. In fact ultrasound and/or canned sprays will drive crud into tiny passages that are dead-end owing to plungers/needles blocking them. Think backed up toilet.
Perhaps you're incredibly lucky and all of those passages are clear but seeing as how just one clogged needle will bring the bike to its knees...
This isn't to suggest that you can't do a perfectly good job. Robust sales of DIY rebuild kits attest to this. But let's make sure you're catching all the gremlins or you could wind up---> :head bang: