Maybe you're overexposing the Foma film? I've shot a lot of it lately, in 120 size, and had no blocked highlights. I've developed it in D-76 1+1 and in PMK. In PMK I have to shoot it at EI-40, but the contrast is normal.

I actually recently did a comparison of Fomapan 100 and FP4, both developed in PMK. The tonality was similar. The FP4 had slightly more highlight contrast. To me, FP4 had three advantages over Fomapan 100. First, it is faster. EI-80 in PMK, so its a stop faster. Second, it does not curl up like Fomapan. I have had a couple of frames with pinholes in the emulsion with Foma, and never with Ilford.

Foma has the advantage of cost.

Ilford FP4 works well in Rodinal, but I think the highlights are harsher in Rodinal than in PMK with FP4.


FP4 in Rodinal 1+50



FP4 in Rodinal 1+50



FP4 in PMK



FP4 in PMK



Fomapan 100 in PMK