Just to be clear, dilution H is double dilution B which is 1:31, therefore 1:63. 1:47/49/50, whatever people want to call it, is dilution E. Anyway, for absolutely foolproof developing at that dilution, you can consult our very own Jason Brunner's page on HC110. No reason to make it more complicated. It just works, flawlessly. Even better in my book, for Tri-X, expose @ 200 and develop with HC110 1:49 for six minutes with one min initial agitation and 4 inversions (10 sec) every 30 sec. Works wonders for portraits and landscape as well. HC110 is dirt cheap and lasts forever. No reason to use it with stand developing unless you are really looking for something very specific. Rodinal works better in that regard, IMO.
Coincidentally, I've just used HC110 to develop some Tri-X and TMY2 as outlined above (TMY for 9 min @ 68 deg). Metered with Nikon F6 spot on skin for roughly zone 6. This is what you can expect and it never fails, assuming you are exposing properly. First two are TMY.