My opinion is you're fishing in the worst part of the Lake for Salmon. Up there, you're better off targeting warm water species.
As far as pressure of taking too many fish out of the lake. Think about it this way. Between NY and Ontario we put about 1 million Salmon in the lake each season. According to the data they collected with a 9yr tagging study natural reproduction is about 50% on average. So, with that said 2 million Salmon enter our system each Spring. 100 Salmon taken a day out of one harbor isn't putting a dent in it. If we were that good on the lake the trib fishery would be bad, and it never is.