Thanks, Roger. The ‘new’ Easton carbon poles are available from Quest Outfitters in Florida, also from Tent Pole Tech. The smaller diameter is light, but has too much flex. The heavier one looks like it would perform well, but at the 33% weight penalty I mentioned. Ordered a couple of each from Quest, but see no reason to add 33% to pole weight when the stronger Gold Tip or Victory shafts are stiff enough, based on their use in the two tents I mentioned earlier.
I do agree with you about the pop-up domes like the Locus where the poles cross once at the top. I once built a gothic arched dome frame of PVC pipe and strung it every which way to see if it could be made rigid. Nothing worked:


This was the most unstable frame of any I tried, and actually think hoops instead of arches would have been an improvement. Nevertheless, not much stability with designs where the poles cross once, the exception being where a transverse strut is added at the top along with front and rear vestibules, like a Hubba, which greatly add to the rigidity of the pop-up dome in the case of my One Planet Goondie. The Locus does not have that, and the small awnings contribute very little to dry entry and exit. Eric B, who experimented with poles crossed under a Tarptent Moment, once posted that the two hoop single cross pop-up dome is a basically flawed design. For some reason, they are very popular in Japan, not sure why. I still have a Snow Peak Lago 1P from Japan which is a similar design.
The best hoops for a tunnel I’ve tried were made of more flexible quarter inch fiberglass at the top center (from poles made for the Early Winters Omnipotent tunnel), but with the outer sections of the hoop made of stiffer carbon. While only a tarp tent, it was very stable:

The tarp was a Gerry product, with pole sleeves sewn on, and extensions and bug netting (not shown) that could be pulled down over the front and rear guy lines. The floor connected with snaps, so it could also be separated and used for lean-to shelter floors. The big problems were not enough rain coverage at the tunnel ends, and worse, a lot of condensation that would develop inside the side walls, despite a lot of ventilation. The photo was on Mount Madison, one of the peaks on the Presidential ridge north of Mount Washington. It was before the hut season began, so the caretaker of the Madison Hut allowed us to pitch camp in the open. Pretty windy up there, but no problem for the tarp tent. Maybe I should have stuck with tunnels. Oh well …