Oh, good. I hope you'll see improvement from what you're doing. My experience has been that the key is really getting the stuff way up in there to clean things out well. I literally do it with my head tipped down into the basin. After the inflow, I'll plug one nostril and gently blow through the other, switch sides. I repeat that whole cycle at least 4 times if not 8. Oh, and I switch sides when I'm pouring the solution in, too.
It takes some practice to get it as far up/in there as possible, but that really is what is required. Without getting too graphic here, I get visible results as I'm doing it, and their volume correlates with how clear things feel afterward vs. before.
Cold air is probably the biggest factor for me, too. We sleep outside, and nighttime temperatures are now just above freezing.
I've been doing the neti pot since 2004, and the only times I've had even moderately bad sinus symptoms since then has been when I got complacent and stopped using it. As soon as I resumed, they'd clear up again.