@Bluejay77 how far apart are those poles? And what are the sticks in the ground for, at the base of each pole? There are some really good dry bean yields there. The lima yields, though, seem a little low... especially given your summer heat. That same heat, I take it, is the reason you don't grow runner beans?
My pole beans are in trellises about 6' 6" tall, with plants generally spaced 12" apart for most pole beans & runners, 15-18" apart for limas and yardlong beans. To judge by the photo, that is probably pretty close to the same plant density. I've used wider spacing if the original seed was in short supply, and the dry seed yield per plant under those conditions is generally 6-8 ounces or more. Sometimes rabbits or ground hogs thinned to that spacing on their own, which is how I first observed the full potential of wide spacing... the silver lining, I guess.
If growing strictly for seed preservation, I usually plan on a 10-foot row per variety. If I am forced to use the backup transplants (as I have been the last two years) then I start 16 per variety, and plant whatever survives... which is usually all 16. Hate to throw away healthy plants, especially when some may be lost in the growing season.
Losing a plant or two to disease is not uncommon, so having a few extra means ripping those out with no hesitation is a little easier.
Because I practice the barrier crop isolation method, my bean trellises are widely spaced; at least 30' between varieties, with trellises of other bean species between, as well as other flowering plants. While there is only one lima & one runner bean per location, there might be 3-4 separate trellises spread throughout the garden to act as barriers. There are also multiple trellises of bitter melon and cucumbers, patches of squash, and "Zebrina" flowering mallow throughout the garden. This method of isolation has been pretty effective here; crossing is generally 1% or less. A couple varieties have demonstrated more promiscuous tendencies in the past (such as Goose), so I give them more barriers & even wider spacing. Only had one cross out of ~200 plants in each of the last two years, and none in the three years before that.
Oddly enough, the same isolation technique has been less effective for tomatoes... probably because they begin flowering earlier than most of the barrier crops. Had to drop a couple tomato varieties because of their high susceptibility to crossing.
