Originally Posted by Lee L
You might find that exposure from a sufficiently distant, possibly diffuse light source will give a more even exposure on the original neg.
Also contact print the neg under even light on grade 5 paper or with grade 5-6 VC filter to make uneven development more apparent.
Yes, I'd expose and print like Lee suggests. To quantify evenness you can check the center and 4 corners with your densitometer (or send it to one of us).