I looked into this at length recently.
The spray angle isn't a huge issue, 5 degrees tighter toward the center of the bowl, might make a bit more smoke, but might also keep the heat more off the lip of the bowl.
The real issue is in the inclination of the injector body in relation to the bore axis.
On the 12V cummins B-series this angle is 15 degrees.
I measured my ALH head and came up with 25 degrees.
So, on one side of the bowl (toward the center of the piston) the spray is going 5 degrees higher than stock nozzles, on the other side of the bowl the spray is 15 degrees lower. Probably make for uneven heating of the pistons or something.