Oh, you could definitely do that, or just lengthen the 4x section to be your terminal tippet.@Jake, thanks for posting your slack formula. As @Tom Butler said, it's helpful to see what others are doing. I have a question for you: do you often tie on 4x to 4x? How do you feel that works out? A lot of my dry fly work is with 4x, so I'm usually aiming to end the taper in 3x and then jump to 4x for the "tippet."
I just like to taper it a bit further as jumping from 3x to 6x is too much of a jump. Anything more than 2x doesn’t work very well down at the end in my experience.