Yeah that sounds pretty much like what I was doing. Last year as a 4 I rode 10 hours or so per week. This winter I rode 17 or 18 hours a week consistently, lots of base mileage. Now that I am racing on a regular basis that number is down a bit, but still getting in plenty of hours. I really do need to focus more on quality over quantity and stop just randomly riding for hours for the hell of it and putting in junk miles. I'm doing okay at cat 3 and collegiate A with that level of training. Maybe a cat 2 upgrade in my future?