Your rim is likely a bit wider than what the frame was designed to use. I've seen this happen when, for example, the owner switches from a narrow "race" rim to something like Sun Ryno Lites which are a few mm's wider. The "cure" that will help but maybe not totally cure the arm angles is Koolstop "Thinline" pads.
And the angle your arms were at isn't anything to worry about. It would have been fine. It just looks a little geeky.