hey guys, without going back and completely reading through all of your stuff. I think maybe my little write up on my exexperience with modifying a comet unit with stall springs and using a 7inch driven may help little...
https://www.oldminibikes.com/forum/index.php?threads/thunder-bolt.115101/page-3
https://www.oldminibikes.com/forum/index.php?threads/thunder-bolt.115101/page-3