just a quick question. if some debris was to fall into the hole for the injectors during a nozzle swap is it the end of the world for my car. i'm hoping my issue is a blockage of some sort or the injectors are not seating completely. i'm going to remove and replace the injectors and hope for the best. if anyone has any tips it would be greatly appreciated. thanks.
Stuff getting into the injector holes won't affect the injectors. I don't know why you're asking about this possibility, but, generally, usually the worst that can happen is that some carbon is knocked off and into the cylinder; usually not any significant amount of carbon "chunk" here. Advised practice is to clean out from around the injectors before pulling; then after pulled to clean the injector bores.
"Leaking" that you'd be able to check for would be, effectively, compression leaks. Spray some soapy water around the base of the injectors and if any of them are blowing bubbles then you've got an injector that isn't seating well. I cannot, however, see a leaking injector being responsible for the IP's IQ jumping around as much as has been reported. Leaky injector -seal- in my car was significant, LOTS of black soot plastered everywhere, yet, the car ran well (no detection of decreased performance at all), well enough to log 50+mpg.
If you're thinking leaking injector bodies/nozzles, then that's another story, one that only a professional can really check. HOWEVER, it's possible given a bad enough injector that one could see tell-tale wetness/blackness on an injector nozzle: I have little experience in a situation like this, but I'm sure others have.
If it is suspected that ONE injector is wonky then loosening up the fuel line to the injector (one can do this one at a time if unsure which one) to see how much difference that makes. With an already rough cylinder it'll make less difference. One needs to place a rag around the area to keep from getting fuel all over.
Lastly, I'm still not familiar with those nozzles. But, 0.216 seems like a pretty big jump; without any hardware upgrades (turbo) you'd need to crank back on the IQ quite a bit: IQ numbers are kind of backwards, so in absolute numerical terms one actually increases the number to reduce fueling. It's kind of silly to be going bigger only to then restrict.
No real chance of resolving this without some data. Either shotgun parts or shell out for someone to deal with it: if you're not happy with the folks you're dealing with then go elsewhere; BUT, keep in mind the possibility that you may end up hearing what you've already heard- without data, which will take someone's time to gather, you're kind of stuck trying to get out of this cheaply.