@skinbones:
I recently kicked up my mileage at the start of june from 30 to 50 mpw, and i ran a few 5ks and didn't do so well on them. I was incredibly sore, i've been doing doubles 4-5 times a week and a 10-12 mile run on the weekends. I started putting in a few days of rest here and there, and took a few easy days, and i felt incredibly refreshed, and ran an unofficial time trial loop with my soon-to-be college team mates and shattered my PR. They were huffing and puffing, and i was keeping up a conversation with them, and the second i noticed their delayed/laboured responses, i rock n rolled and used a street corner to disguise my pace increase. I was gone, give it a few rest days if you're feeling sore, ice after your runs, and you should see the benefits of your increased mileage.