Hey Man,
I had problems too.. I think that this driver had problems..
I was almost crazy, when i thought that the old printer was HP 8600 and HP 8610 is the newer.. After this, i installed the printer using driver of HP OJ 8610, and this resolve my problem..
The printer has just PCL3.. (not PCL5 and PCL6)..
But this resolved my problem, and i wish that resolve your problem too.