Re: 3 wt. question--
What fly line are you using? 7'6" 3w's lack power at 40'. It's a small stream rod. But it might like a TT taper line and be good at that distance once in a while. I've said it before, some rods like certain lines and a dog rod can become a gem with the right line. They are NOT created equal.
Plus, what rod is it? Fast taper, medium or full flex.
Life is not like a bowl of cherries. It's more like a jar of jalapeno's. What you eat today might burn your ass tomorrow...