I hear you, and personally, I agree. bear a few things in mind though. When you talk of a rod being a 6wt , for instance, what you actually mean, is that the rod is rated for a 6 wt line. Rods are categorised according to the line weight that the manufacturer recommends will perform best at the rods intended specification. Rod themselves do not have a weight rating, but go according to their line weight. So, what we should really be saying instead of , " its a 6wt rod".... is that, "its a rod rated for a 6wt line". Ok, now that we have that understood, its fine to choose a line for the rod that is not the line weight that the manufacturer reccomemds for optimum performance. all we do by using a heavier or lighter line, is changing the rods action. Think about aerialising more line in the cast. That would mean more line out the tip, thus heavier, thus a slower casting stroke. Also very heavy flies have an effect. if you are fishing with multiple heavy flies, you will also have an effect of slowing the rod down.
A very fast rod , is made this way for a purpose. To shoot line with as few false casts as possible, you need a fast rod, so the BVK is designed to make one or two false casts, a quick haul, and then a shoot, and it does it well. there are several other rods that do this, the Sage TCR, TCX ranges are also very fast rods designed for this. Basically if you don't need to be doing this type of casting, then by all means try a heavier line for slower more delicate work, but if a manufacturer says its a rod rated for a 6wt line, its probably worth looking at the reasons why they give it this rating. If the rod doesn't perform according to your requirements with the recommended line, then the chances are that you bought the wrong rod for the application.
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