Yep a 415 chain is for motorcycles and is simply overkill on a MB. Your bike looks good.
I run a 41 with a rear sprocket adaptor. The 41 still seems like a lot of extra weight spinning around so I'm going to switch to a regular bicycle chain.
Anyway I have mad skills, a machine shop and a website. I am here to serve so if there is anything I can do for you let me know.