That negative looks underexposed to me, unless you intended a silhouette of the leaves. That to one side, making a "proper proof" (that is, making a contact proof where the film edge is *just* at paper d-max) will tell you a great deal about your exposure/development practice.
Film base fog doesn't matter too much, as long as you have enough exposure to separate the shadows in your picture from the fog.
Overall proportional image stain is one of the benefits of pyro development. But the amount of otherwise worthless fbf depends on the film. HP5 is what I'd call a semi-thick emulsion (not thick like old-school Super-XX, for example, but more so than most modern films). Rotary processing exacerbates that somewhat. So you will get some excess buildup along the perimeter edges of the film, which either requires some aggressive burning-in of print edges and corners, or by realizing that in advance, you can compose your image just a little bit bigger than what you plan to print; in other words, crop the negative all around just a little when printing. It's a different issue from residual antihalation dye, which washes out, albeit stubbornly in some instances. The cleanest sheet films with respect to this issue are TMax - virtually zero edge fog in my case, and no residual dye either.
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