Pedantically, you have something working; you just do not like the results and wont bother to actually do the homework of trying to learn about settings that might get you what you want.
So, in the mean time, why don't you do some actual work trying to tweak settings. because your 2g width is set to 20.
Is the device smart enough to use one radio as the backhaul and the other as the AP eleminating sharing one band and halving the data rate??
You don't know, do you?
I know, but you, obviously don't. I'd take a chance and tell you how to do it but you have exhausted my will to spoon feed you anymore.