I don't know your locations. But I do have some advice on patterning them. I had a great deal of success with catching grayling by casting an elk hair caddis rather thoroughly creamed with floatant above a small prince nymph (I presume any small beadhead nymph would do). I found that if I cast out into the current followed by a significant upstream mend that permitted the whole rig to swing to a current seam was a successful pattern that took quite a number of grayling.
If you find a pocket of small grayling, see if there's some laminar flow downstream. If there is, if there's something blocking that laminar flow, you may find larger grayling there. In three different locations where I was catching small grayling, I discovered that pattern of the larger fish downstream in a divit or behind even cobble sized rocks. In one place, it was a remarkable different of going from 6" fish to 20" fish.
Here's a pic to tantalize you.
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