Kype, I know all too well about people seeing big rivers like the Nass/Skeena/Fraser, and watching them wade up to their waste only to launch their fly line as far out as they can.
Speaking from my own personal experience, I've hooked sockeye on the Skeena in 2 feet of water, maybe 10/15 feet from shore. It's the people that don't know that the salmon swim close to shore, that ruin it by pushing the fish out by wading into their travel lane.
My comments more refer to the fact that fishing for pinks on a small system is typically different than fishing sockeye on a mainstem big river. In a clean system, big river or small, I don't even use a sink tip, like I said I use a floating line, long leader and slightly weighted fly, because I know the pinks will hammer a fly 2 feet under the water surface. This same presentation, has never taken a sockeye in the same system.
I'd encourage you to use a floating line, or even an intermediate line with a slightly weighted fly, and try on the Fraser. If you hammer the sockeye, PM me