Keep stripping until the line is completely straight downstream. Working in a bit of line as fish will still hit it as it tosses and darts in the current. Rollcast out for the next presentation. The downstream mends can be angled so as to run the fly past fish holding water, like the heads and tailouts of riffles, rocks and other structure. One thing must be stressed though.
Streamers are highly effective - under the right conditions.
I've rarely been very successful mid day in gin clear water. On my first trip to the AuSable, I did pick up three smallish fish on streamers by picking water with lower visibility, the shallow tailout of a plunge pool. The frothy, turbulent water gave the fish less of a look.