Since I'm OC based, not too familiar with LA but I'll check around. Call Helen's and see if they can recommend a professional fitter. Also do not be afraid to ask the clerks if someone there has fit training. Ask to see an older clerk or the manager. I don't like the young ones working on me either!

Keep at it. 10 miles is good. 20 is better and so on. Next year you'll be doing the metric or even the century at Cool Breeze!!!!