Sorry in advance for the semi-hijack.
So I’m confused at some of the comments/discussion above.
Maybe SSpey can comment, or someone else.
First off, a “fast” rod has a relatively WEAKER tip - not stronger. Sometimes people use the words “very progressive” but it means that for a given wt rating a rod bends more towards the top end, i.e. it has a measurably larger “common cents” angle. The taper/flex modulus increases (progresses) rapidly at the top of the rod. This type of rod has closer to what one would think of as a traditional euro-SCANDI type action.
Burkies are interesting in that, while I’m sure they may have certain common jumping off points in the process, they are all designed and tweaked somewhat independently. In contrast most other rods get their taper design finalized and that gets (more or less) scaled up and down the weight spectrum. From the four burkies I own and a few others I have tried it is VERY easy for me to imagine them all having different personalities, but I haven’t met a truly “tip flexy” one (ultra fast, bends more towards the top). But from what SSpey said sounds like 8128 may be as close to this as Burkies get.
What I’m confused about is the idea put forward by the OP and maybe some others above that a very fast rod is better for skagit heads and a “softer” rod for lighter stuff as this goes counter to most of the prevailing dogma. Because I’m a weirdo, every time I decide I like a particular type of action I go out and deliberately play with the opposite. Usually I come back, but within enough time to readjust I realize other extremes work equally well, but are just different aesthetically. Lots of people like the feeling that THEY are making things work (faster rods) and others like that feeling of having the line go a mile seemingly without effort. But I’m not sure I subscribe AT ALL anymore to the theory (to take one example) that stiffer tips, hence deeper-flexing, “slower” rods like an MKS are objectively “better” for big, heavy tips and skagit heads. But I know a lot of people believe this to be the case, and I certainly enjoy this more depending on my mood. But this is seemingly exactly the opposite action from what the OP is looking for. I do know for sure if you are used to one action and pick up a rod with a very different action the first cast (or the first 500 maybe) will be crap - until you adapt.
So I guess my confusion is, unless the OP is talking simply about the added carrying capacity of an 8wt as opposed to a 7wt, I’m not sure I get why one would think an ultrafast, tip-flexy rod like the TCX would be a priori a great winter rod for skagit heads and bigger tips rather than a rod with a more uniform progression like a middle of the road burkie - or any other Spey rod with a more uniform progression than the TCX (has to be like %90+ of all all Spey rods). I definitely get that someone’s tastes could develop that way, but not that it has objective validity. I’ve certainly heard the exact opposite argued many times.
Someone square this circle for me please! What am I missing? I feel like it must be something semi-important if it made my brain break so bad.