Fascinating topic, indeed. I spent 3x 100+ day seasons exclusively skiing the 190cm OG pintails, and (obviously) absolutely loved them, overall, but also had a few things I always wanted to address.
(1) They have an extreme mount position (-15cm, same as the Sanouk), extreme sidecut offset (ski's waist was ~15cm behind the recommended), and extreme tip-to-tail delta (15mm). Generally, only the Salomon BBR, Lhasa Pow, and some wonky euro touring skis spring to mind as "relatively modern" skis combine that rearward of a mount, more delta, and sidecut offset.
(2) They had an extreme flex pattern with a quite soft tip to give lift in soft snow and a stiff tail (to account how short the tail was w/ the set-back mount). This made them good for skiing down the fall line in untracked snow but like the Sanouk, limited elsewhere.
In particular, I always felt like they were cumbersome in the woods, as fresh snow got sun, any sort of wind effect, tail would knife on airs, and they could ride too deep in the tail in really deep low density snow. I really prefered how my OG skis felt at +2.5 to +3 in untracked snow, but that was way too far forward on the ski's short shovel in any kind of tracked/variable/wind effect.
I would say, despite not making sense at all on first glance, the HB122 ski is for sure the MOST similar to the OG pintails on soft snow days overall. It has that "trampoline on your feet, surfy like crazy, unsinkable tip" feeling that is indescribable unless you know already, and the mega tail rocker actually makes it behave a lot like a setback pintail. The specs on paper are wildly different, but the experience on snow is remarkably similar. The HB122 is 2400g, is quite smooth and supportive, and is actually super fun overall. Like it shreds. Wild for me as a mega meathead stout ski fan to say.
Anyhow, back on topic...So what am I doing here? I wouldn't consider the Swallowtails to be a direct lineage of the OPG pintails per-se, but more a spiritual descendant. The I know you don't care about the Swallowtail, but the biggest thing I think you would notice, coming off the skis you are, is that the ski will bring the slashy easily released tail of a setback pintail (due to the cutout's reduciton of torsional rigidity) to a much more balanced ski shape that rides more neutrally in untracked snow, and is legitimately fun as the mountain tracks out.
With the Swallowtails, the mount point, rocker profile, flex pattern, etc make for a ski that is comparably surfy in deep snow, but WAY WAY WAY more fun everywhere else. The R rocker profile would be the most analogous, just without the flappy tip, with much better pivot at lower speeds, and a billion times more fun as a "soft snow ski" instead of just being amn "untracked snow ski".
My .02! If I glossed over anything you want to expand on, just LMK! Happy to unpack in more detail.
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