I've found that traditional hackled dries are not nearly as good for these hatches as the alternatives. You can fill a nice fly box for those tailwater / spring creek bugs with rs2's, comparaduns, sparkle duns, hanging midges, and zebra midges, all without buying a single piece of rooster hackle.
Compara- & sparkle duns: https://flyfishingthesierra.com/spardun.htm
Zebra type midges
That site also has sections specific to bwo and pmd dries and nymphs for life cycle type tying.
Little Griffith's Gnats do work great on midges, but the size is not so demanding. Maybe a single 20 or maybe 22 whiting grizzly hundred pack.
If you do go the hackle route, in those small sizes you'll want to use Whiting, and you'll want to be very sure of what you need and what you are actually getting. 100 packs are not a bad option to avoid beginner purchase errors if you do go the hackle route.
For larger attractors go with capes or half capes, probably grizzly and brown. Whiting's intro pack with grizzly, brown, dun, and either light ginger, cream, or black is a decent option. Those will also get you a decent number of the little hackles in the colors you need for pmd's and bwo's and Griffith's, maybe even other small hackled midges.