Woah cool - this is really useful!
Can you provide me with Street names for some Streets that you believe you have completed but are still displaying Nodes in Node Hunter?
In your last screen shot, for example - those four Nodes on the left look like they’re attached to a completed Street. Your first image also has a lot of Nodes that appear to be completed.
I’m pretty sure that this is tied to an ongoing issue with my code… I’ve got it in my To Do list as “solve issue where path is not within 25m of node, but is on a street” & I can further explain it as:
Each Street is made up of many individual Nodes. In the same way, each Activity is made up of many individual Paths (horrible name that I blindly adopted from Runkeeper because they were the first run tracking service I worked with).
My code takes each GPS coordinate (Path) from your Activities and checks to see if there is a Node that is within 25 meters of it. If there is, then it marks that Node as complete. The idea here is that I’m accounting for some GPS drift / running on one sidewalk or the other down a street.
This has a funky edge case where you might have 10 GPS coordinates down a Street and that Street might have 5 Nodes that are spaced out in a way where you could conceivably run down a street and not match any Nodes. 
So if you share some Street names with me, then I can compare the Street Nodes with your Activity Paths and see if this is what’s happening…