At 12 birds for 5 days, you're averaging just over 2 birds/day, almost 2.5. You don't say how many "we" is, but if everyone has that kind of success and if it's more than just 2 or 3 of you, that's outstanding. With access to good private ground, you could expect that in Kansas or even better. I can think of at least 3 hunts last year where we did better than 2 birds per hunter, but with only 2 or 3 hunters. These hunts were a mixture of WIHA and private.
But, it doesn't sound like you have access to good private ground. If you shot 2 birds per hunter per day in Kansas hunting exclusively WIHA, you'd be doing very well. You'd probably be top 10% in terms of success based on the last year or two. 1 to 1.5 would be a much more reasonable expectation.