Have you had the car dyno tuned? In all likelihood your car is running way too rich. I have a similar combination as yours, and when I had my car tuned, it was running like 8:1 air:fuel. The 30lb injectors were reset to about 50% of their capacity and the car runs much better. Picked up 62 HP in tuning.
If it was me, I would keep the 30lb and just get it tuned. Why spend the additional $$$. Even with the 24lb, it most likely won't be tuned correctly. There is no combination of aftermarket parts that you can mix and match and expect it to run as good as when it left Ford by just bolting stuff on.
All you guys who mess with your fuel injection system and then don't have it tuned are just kidding yourselves. Most of the bolt-on goodies actually make a car run worse unless you go the extra step to tune it for peak power. Spend a couple of hundred dollars and get it done right.
Flame away.