Update: I blew the dust off the Roxas (just kidding, no dust) for a trip to Mt. Rose this morning. The fit was as I remembered, see above. I've been skiing my Raptors so far this year and the last trip up I just didn't feel "right". I wasn't sure if it was the skis, the boots, or me. Conditions were quite good so I'm sure it wasn't that. Usually, I'm pretty convinced I'm the weakest link but the day did get better.
Fast forward to today. Still great conditions, but different skis (Liberty Evolv 90s vs K2 Mindbender 90s) and different boots (Roxa vs Raptor). I felt much better today and I think the main reason is the more upright stance in the Roxas. As noted above, I noticed this last spring but wanted to be sure I really liked the more upright stance. Whether it is the few degrees less of forward lean or just how the boot interacts with my shin, I felt significantly less thigh burn and more direct control. I felt very connected to the skis.
I usually feel great on lower angle groomers with the Raptors but once it gets steeper I am not as comfortable/confident in getting far enough forward to keep pressure on the tongues. On the same runs with the Roxas I didn't feel that concern. No matter what boot I get next I'll likely go with a more upright stance than the Raptor. This is no knock against the Raptor, as it is a high performance machine. I just may not be as high a performance skier as is needed to drive the boot. Sometimes you have to face facts.
I'm guessing the temp when we were on the hill was in the upper 30s or low 40s. The Roxas felt like they flexed the same just out of the heated bag as they did on the hill. Again, that's the Grilamid vs PU shell. The Grilamid seems to be more stable across temperatures. I did switch the flex from stiff to soft and the boots became more progressive as opposed to on/off. As a side note on temperature, the Roxas don't seem to be significantly warmer or colder than the Raptors.
The bottom line, as of 2:11pm on 12/6/2019, is I'm going to put my footbeds with the Thermic heaters in the Roxa boots and get some more laps. This could change, of course, but that's the plan for now.
Continued pros for Roxa: light weight, consistent flex, grip walk soles, walk mode
Possible cons: inability to do much, if any, canting work due to pin inserts and hollow soles; the buckles take a little getting used to but I'm sure they function great in the back country.