The four "Bay" pictures were taken with the Technorama and a 90mm.
Common wisdom is that a 72mm or a 75mm are too wide for a 6x17 and a 90mm is more balanced.
My project had to do with using the 6x17 as a glorified point-and-shoot in challenging lighting conditions (metropolitan areas at night). I reasoned that the 72mm SA XL - with its huge circle of coverage - could be used wide open and deliver images that one can enlarge 8x-10x and still be on the safe side quality-wise. Looking at the MTFs it seemed possible to cover 6x17 at f/5.6. This is not the standard way of using LF lenses (I mean wide open), but rules are made to be broken, right?
The two pictures below were taken at f/11 and f/5.6
with the center filter on. Please disregard the fact that they are really ugly, it was just a test

and that the resizing has shifted a bit one vs the other. Both taken hand-held.
f/11
f/5.6
The fall-off is noticeable at f/5.6 but I think the image is still usable. What is for me more important is that the resolution at f/5.6 is quite good when compared to that at f/11. Not just in the center (that's to be expected) but in the corners as well (I used a 10x lupe).
The shutter ghost images are instead a cause of concern, because if you look at the shadows the sun was way way off, and I did take great care of staying away from it. Since I used the 72mm XL for several years with no such problems and only a few times with the center filter on, my educated guess is that the latter has something to do with the problem. But it's just a guess.
If you already have a 72mm XL - like I did - is one story. If you do not, I think it's an overkill to use such a lens on a 6x17, unless you really need to shoot at f/5.6. It's expensive, it's bulky, filters are 95mm (I use the Lee filter system on it because once you have the filters for other lenses that's the cheapest solution, it requires only a special adapter). And even if you have such needs I would consider the 80mm SS XL instead which is much smaller. Performance-wise is probably a wash: it's a bit faster than the 72mm SA XL, the circle of coverage is a bit smaller, resolution wide open a bit worse, but these are all measurements, I'm pretty sure that a
print looks just as nice. And that 10% shorter focal length of the 72mm XL is not dramatically altering the perspective.
For "normal" use I guess the 90mm is a better choice. Just my two cents.
Cheers!