7x is pretty fine tippet material.I use 6x 0r 5x trouthunter flourocarbon tippet most of the time with excellent results.I usually tie on a 18-24 inch piece with a surgeons knot to my leader.Try stripping a size 8-10 wooly bugger in olive ,brown or black with little or no flow,the fish will wack them on taney.soft hackles also work well with an orange or red body in size 14-18.Try casting out from the boat and let it swing in the current till it is almost downstream from you and strip every once in a while,they will really smack it .I like to use a sink tip line or a full sinking line to get those flies down in the water column with a 4 or five foot tippet in 5 x. you can buy a sinking leader 10-15 feet with loops and attach it to your regular flyline loop so you don't need a extra spool Phil can show you how