Andrew,(posted 8521 days ago)I use HP5 and FP4 both in D-76, generally 1:3 (66 degrees F.) for normal and moderate compensation times. The interesting thing I've found is that the two films seem to require nearly identical processing times, so when I tank or batch process (Jobo), they can go in together.
This combination affords me predictable control of highlight densities, good separation, and moderate grain. The two films print in a similar fashion. Of course the FP4 is a tad sharper, with finer grain, but hardly noticable from "viewing distance". Hope this helps!
Chris