I've recently installed rockauto injectors into my car and they seem absolutely perfect, far better than before.
http://www.bmwhaus.ie/forum/showthread.php?tid=6441
Fuel economy seems to have improved too, I had an indicated 39.2mpg over a 85km run on the motorway from south of Newry to Dublin with the cruise set to 100kmh which was surprisingly decent I thought!

You'll need 6 decoupling elements too (online is cheapest - I used ECS tuning).

What exactly are the issues? I have 5 good "old" style injectors here that you're welcome to try to see if they could resolve the issue.