I don't know what type of technique you're using, but if you're swinging tips the number one thing that has made me more effective is concentrating on slowing my fly down. When I first started fly fishing for steelhead, I would throw on the fastest sinking tip I had, cast it nearly perpendicular to the current, throw a big mend in, and then let it sink until it came tight and started swinging. What I didn't realize at the time is that fishing this way resulted in my fly being ripped across a good portion of the swing area (because of the belly in the line), and there was no way a steelhead was going to go after it. When I do that now, I can actually feel the "push" on my fly and adjust my swing accordingly, but when I first started I had no idea this was happening. What I try to do now is quarter the cast downstream quite a bit more, and instead of throwing a herkamendous mend in there, I just throw a light mend in to get everything lined up, with the fly downstream of the tip, which is downstream of the belly of the line, etc. Then I just let it come tight and follow the tip of the line with my rod tip. This results in a much slower swing, even if you aren't getting quite as deep. If you want to go deeper, just throw some T-14 there and fish it the same way. If you're getting a significant belly in the line that's causing your fly to speed up, sometimes you can slow it down by leading the line with your rod tip to keep the line straight. This results in a slower swing through more of the holding water. Another recommendation I would make is to make sure you're always holding the line with a finger or two. Having contact with the running line allows you to feel small plucks that you won't if you're just fishing off the reel. If you're swinging your fly and you feel a pluck that may or not be a rock, swing it through there again with the same cast. If you don't feel the same rock, chances are that it's a fish. At that point, I'd swing through there a couple more times, letting out a foot or so each time, and if you don't get the fish, shorten up 10-15 feet, change your fly, and run through there again. Lastly, don't get discouraged. I know there's a lot of skilled anglers on this board that have been humbled by steelhead, particularly in the winter. If they were easy to catch, it wouldn't be any fun!