I strongly doubt your alone.
I have had a great year and caught my largest Bass ever so far, but I say this to encourage you only. Here's what I have been doing.......
1. I bought a great Loomis surf spinning rod and aren't in the least bit afraid to use it when the wind is blowing beyond my casting abiity,particularly at night.
2. I have halved then halved again my retreive speeds. I seek only to keep contact,very close contact, with my fly and let the current give it all the action.
3. I went to www.jackgartside.com
and bought some of his tied flies. They were a bit more than had I tied them myself, but they are tied well and I am fishing and not tying. I say his flies, because he uses a ton of marabou and other breathing materials which give the fly action on it's own without my need to add action with the rod tip. I move the rod tip. I put an S in the line. I am now out of direct contact with that fly and may miss a strike and loose the change to set the hook. I am convinced this has happened to me 100s of times and I never knew it.
4. I hired a shore guide and told him I wanted to learn more than catch fish. I used a guide on Nantucket out of Bill Fisher's Tackle, but there are many fine ones around Boston. You can even hire Jack Gartside himself to help. Why did I pay for someone's help when I used to teach casting lessons years ago for Orvis? Because I needed the help. Period. I did whatever they said to do right down to changing my leader system etc.
5. I started keeping a journal with day, sunlight, current, tide, moon, flies/lures used,fish, drew a picture of the area with current sand bars etc.
6. I am ardently reading the forums on RT and fish only those locations where tons of fish have been reported. Fortunately for me, I know Plum Island very well.
7. I guess in closing, I have redoubled my efforts and really tried to examine my flychoice, retreive speed and meathod, learned when to fold and go spinning and put in a ton of hours with my headlamp on.
It sounds like you are putting in the time, I just thought I would mention what I have done. That being said, I am sure to go on a prolific dry spell now.