Your typical week adds up to a lot more than 25-30 miles so maybe you're just not running as much as you think you are.
Personally I've found the biggest gains have come when I've cut back all the quality sessions and just concentrated on consistent high (for me) mileage for a period before reintroducing a moderate amount of quality.
In a slight change to my carefully thought out plan, mcf and I took the kids to the local park and then took it in turns to do intervals round the perimeter path. I did 4*(200,200,400) fast with equal distance jog recovery. Seemed like a very pleasant and family friendly way to do a session.
Good luck Richard if you're reading.