For the injectors, I would go with Piers. The reason I say this is, he has the best warranty program around. If you are running a 18. 5 housing, I would concider a 16. It may not give you an imediate power increase but over time it will allow you to run cleaner and improve milage. PODs need lots of boost to run clean.
If you haven't already done it, I would go with a better exhaust system and a better intake. This will allow you to get the full benifit from the larger injectors.
I noticed you have your timing turned up. How far? This will also help with smoke and throttle responce.
Good luck and have fun with the bombing.
Dave