There are days when I have a tough time getting hook up also. I feel (but have not kept count) that I do better when using larger flies sizes 18 - 14. Then I usually do better after the first couple hits. I find my hook up percentage drops with the sizes 20 - 26. I can can frustrated when the trico hatch starts but seem to get better as the season goes on. If I find one fault that can be corrected is striking to fast or to hard. Particularly when the fish are just sipping small flies off the surface. Give the fish a second or two to sip in the fly and then turn a bit. Then a gentle lift of the rod is all that is needed to set the hook with most shrp dry fly hooks... Good luck.
Bill A