PMK - less stain on FP4+ than HP5+

I just started using PMK pyro on FP4+ and HP5+ 120 size. I did a test with one roll of each with different exposures, etc. as I would with a new film/devo combo.

I developed as per Book of Pyro: 10 min for FP4+ and 13 min for HP5+. Water wash, then Photo Formulary alkaline fixer, two minute dunk in used devo, then 20-30 min wash.

The HP5+ is nearly olive with a slight fog. The FP4+ looks almost normal relative to HP5+, with no fog, a slight yellow-green stain, but much less than HP5+. Compared to Tri-x or Tmax in XTOL (neutral to slightly blue), the FP4+ looks very yellow.

On test prints, to my surprise, FP4+ and HP5+ had very similar grain, perhaps due to greater stain. I used the smae water, dilution, etc. for each roll. I mixed fresh devo for each with one roll in a one liter two roll tank, full of devo. There was possibly a tiny amount (5 ml) more air in the HP5+. In neither was the tank totally full. The only other difference is that I developed the HP5+ roll first, and used that devo for both post-fixing bath.

Anyway, my two questions are:

1)I have heard that faster films stain more. Is this common experience? Doest HP5+ stain more than FP4+ in others' experience?

2) Is it peoples' experience that pyro developed 120 HP5+ and FP4+ have similar grain?

Thanks.

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