Re: Rod wt. and line wt. question
Then Steve's advice will suit you best. The only reason there would be for you to then use the seven weight is that the tip on it will sink faster then a five weight.
In sinking lines, they give you an average sinking rate. Say 4-8 inches per second. The difference is between line weights. A five weight line will sink slower then a seven weight line as there is more room to put extra sinking properties in a larger line weight.
Anyway, have a blast!
All Means All