Four Miles, Poor Pacing

I did four miles today at a 'good' 7:17 min/mile clip, although my pacing was poor. I actually would have preferred to have hit consistent 7:30s. Mile-by-mile: 7:37, 7:07, 7:07 and 7:17. It's a tricky rout because the second mile is mostly down-hill and the third mile is mostly flat - so I'm having trouble not pushing the pace then. Friday, I'd like to get six miles in at a 7:40 pace. I'll have to figure out if I want to do a straight six at lunch - or do the six as the middle six of my run home, which is ~9.5+