I agree that HP5 is a pretty forgiving emulsion with respect to developers. I've used Ilfosol, DDX, Paterson (can't remember which one), Neofin Blue and now XTOL. I'm very happy with XTOL - fine grain, very consistent and used in my hands 1:1.
I determine the film speed using a densitometer. I also use the densitometer to determine the development time. The correct film speed is the Zone 1 exposure that produces a density of .10 over film base + fog. The development time is that time which produces a net density for a Zone 8 exposure of between 1.20+ 1.30.
Most of what I shoot goes on HP5+, both 35mm and 120. Most often developed in Xtol 1:1 at Kodak's recommended times. For really flat light (Seattle in the winter, for example), I expose at EI 800 and develop it in Microphen 1:1 to puch up the contrast a bit. I've tried Rodinal in the past, but usually have to expose the film at EI 250 to get sufficient shadow detail. I don't mind the grain you get from that combo, and it's really sharp.
Some contrast in a negative has to do with the lens being used.
As for developer, I started out decades ago with D76, then experimented with Rodinal and several other developers (Acufine, Diafine) but always returned to my first love: D76. I almost always use TriX, but on occasion have used HP5 and HP4, both fine films. I also feel that TMAX 100 in TMAX developer yields a very fine-grain negative.
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