I run a 50/39/30 with a 12-27 cassette and I live in a hilly area. I've maybe used the 30 ring once or twice in the past year as I have been attempting to spend the majority of my time in the middle ring. If I am on a tough hill I generally will stay in 39/19 or 39/21. If it's really tough or I'm really tired, I will go to 39/24. I try to never use 39/27. Do those sound like severe chain angles? They don't look like it to me when I observe them while riding.
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