Balance rates dont always tell the story of bad injectors they help but dont always trust the balance rate. I'd do what blk smk said and pull the passenger side apart check it and if need be pull the driver's side apart again an watch for leaks
almost sounds like he didnt change any injectors out
Wow I didn't think of that.
Op did you get a receipt from merchant? There should be some kind of code or numbers etched on the injectors, maybe you can call merchant and get those numbers to validate.