I don't believe you can just ask/say 7wt or 8wt, unless you're asking about the same model. There is just a huge difference between manufactureres and models. For instance a Sage 10wt Xi2 has a great deal more lifting power than a 10wt XP. A Scott S3S 6wt will drag a St. Croix LU around all day. Hell, that 6wt Scott has more lifting power in the butt than an 8wt XP. All are great rods, but their applications can be so different. If your "playing off" your current 9wt. and want to "drop down", I think you really need to check specific models to see what gets you the difference you're seeking.