Okay, thanks. That helps.
Just to confirm: When on the flats, you can hold with a certain cohort, but not uphill?
Weight could definitely be a factor. (It is for me too. I’m slight by climbing standards, but big by skimo.) I’ve been informally noting weight:height ratios for a few years. It’s not uncommon for the top guys to be 1.9#/in. (I’m 2.2.) You’re 2.6. The numbers will vary, but it’s the general idea of a power-to-weight ratio. If you’re ~35% heavier per inch of height, that’s a huge difference to overcome.
I’ve noticed similar things cycling. I have a couple of large powerful friends that can drop me in the flats, but the situation is reversed on long climbs.
So what to do? If the weight is muscular, then it may take years to lose it. As far as I understand, long, easy endurance has a catabolic effect. And you’d want to avoid any upper body work. But I haven’t found much other information. When I Google things like “lose muscle” usually it’s just results about sick people…
In my experience, it takes a long time. For example, when I was sport climbing a lot, I was heavier up top and lighter in the legs. But after six years of skimo, it’s only slightly reversed. My “fighting weight” is pretty much the same, but the furniture’s been rearranged. (My wife prefers the climbing arrangement…)