It can, indeed, be interesting to troubleshoot these things … yet, that’s exactly what you have to do. (And by the way, you have to do exactly the same thing in Photoshop, for the same reasons. Especially once you leave the comfortable well-trod pathways and start to ask that race-horse to do anything more than walk.)
One thing that can really help you is the Normalize node. It “squishes” its inputs into a known range of outputs… and even though it might well not be a node you want to keep in the final version of your “noodle,” it’s certainly a visually informative one to drop in while you are “debugging” your data flow.
There’s really no way around it for long, however: you are “debugging” what is actually sometimes a very intricate “computer program.” Node-networks of all types are a very sophisticated way to process data. Therefore, they come with the same set of “issues.”