Progressive springs will make it dive less depending on your weight. Remember an object in motion.
I have progressives and for the most I like them. They could be stiffer but my stock springs were just short of being a slinky.
20 weight belray fork oil is what I push. If you don't like it you can change it. If you have access to a drill and tap there's no reason why you couldn't drill a hole in the fork and tap it to screw a bolt in line the cb400 forks have. Then i you want to change the fluid you wont have to take the forks down again.
I have progressives and for the most I like them. They could be stiffer but my stock springs were just short of being a slinky.
20 weight belray fork oil is what I push. If you don't like it you can change it. If you have access to a drill and tap there's no reason why you couldn't drill a hole in the fork and tap it to screw a bolt in line the cb400 forks have. Then i you want to change the fluid you wont have to take the forks down again.