Hi Jim
I am still using stock injectors but due to mileage on them looking into replacing. Look into Big Bang Injectors. Local shop has said they have been working well for them and are one of the only ones I have read about making mechanical changes to help them with longevity. $$$$
I have always liked the Smarty.. and UDC has helped with making power and driveability. Cannot go wrong with using smarty.
Wish I had some actual use in my truck regarding injectors to pass along. Would of liked to help as you have always been a giving person on the forum.
Happy Holiday to You.
My Industrial injectors have done fine, almost 20k miles on them now. Balance rates are good. Tuning should definitely be done with EFI from any reputable tuner such as ATP, Anarchy, etc, but if not then you're looking at PPE if you want lots of power. otherwise the good old Diablosport runs fine on duramaxes and is good bang for the buck.