Being slow in the middle laps shows your aerobic threshold(out dated term, I know) is a bit behind your other fitness areas. Your basic aerobic isn't bad for the pace you are running because you are bouncing back off the slower pace.
With not much time I would advise that you get out more slowly in your next race, then try to hold that pace through the middle laps and you should still be able to finish at the same, or close to the same pace. This will be tough to do with the extra adrenaline of the state meet but if you are careful you can do it.
So lets say you feel your ready for 9:20 (just picking a time out of the air, you can adjust this to whatever time 9:00 or 9:40, 10:00 doesn't matter) your going out 68/69 then hitting the half in 2:19 or so, then you slow to 73's for the next m2k, probably running 71, 72, then 73,73,73- give or take, you hit a lap to go at 8:22 and finish with a 67/68- your fastest lap and get end up 10 to 15 shy of your goal- Again the exact slits are easily adjustable to your actual times.
So what you should do is cut back your goal a bit go our conservatively. So aim for 1 second per lap slower(more if you have been fading worse in the middle then I suggested above) then you have been- so 71 instead of 70 (69 instead of 68- 74 instead of 72) So in our 9:20 case you go out at 71-2:22- you will feel better here then you have been, because you are slower- 3:33, then 4:44- you have been hitting the mile in close to this time, and even though you will still be working pretty hard you should find that the difference is that when you went out faster no matter how you pushed here you didn't hit the splits, now you will still be hurting but if you push you hit the splits, so you cover the next 1200 in 3:34 or so, last lap at 8:18- you have snuck ahead of your 'normal' pace and still should have a good finish in you of 67/68- gets you to the line in the mid 9:20's, not your original goal but a step forward from your normal performance.
Next year do more 20min tempo's(knowing it is better to run them slow then to have to slow down at the end of them- ie running a 4 mile tempo in 22:00 with splits of 5:40, 5:30, 5:30, 5:20 is way way better then running 21:30 going 5:10, 5:20, 5:25, 5:35) also run some intervals year round at your goal pace but do them with good rest and never go far enough to have them get painful, you want to run a good volume of work at your goal pace focusing on being relaxed. So say next year your looking to run low 9:00's so your goal pace is 67/68, run 400's as early as this summer at that pace with full recover so that you feel controlled and relaxed for all of the repeats. It isn't about anaerobic conditioning, it is about relaxation at speed and building mechanical efficiency at goal speed. If you can run RELAXED 600's at your goal pace as the year goes on great, but the key is always relaxed.