The 2 under thing isn't a surprise though.
The set of 10 I talked of above were all developed the same per Ilford's instruction sheet for EI 500, the target was normal contrast, only exposure was varied.
No great heroics on this set.
I use a Beseler PM2L to set enlarger exposure, the challenge is mostly in finding the right point on the negatives to peg to. The PM2L has the same issues as any meter does in the field, one must properly judge what is being measured. (For those that don't know the PM2L and it's kin are basically spot meters for the enlarger.) Once I found the right point to peg to the negatives were equally easy to print. All done at grade 2.