Rival, it's a good strong frame so I am sorry to hear you are having problems.
They make the backend wide so that big wide street tires will fit, unfortunately this does make some problems like you are having. A longer spindle plus extra spacers might solve the problem, but I don't know if anyone makes longer spindle or if they are all the same length?
I do not have this problem with 2019 frame. I think back end was a little shorter with 2014 version? Right now I use 24 Tooth sprocket, 165mm cranks and no problems with how close crank arm ends are to chain and seat stays when pedaling.
I hope you can find a solution.
Edit:
our avatar pictures are almost the same