A single chain client will require more time slots than a dual chain one. But it's also relevant to signals too.
So there is nothing wrong with 1x1 clients with good signal. For example I'd prefer a 900 loco with external antenna 1x1 with a great signal before I'd leave it using 2x2 with a weak signal, as that affected capacity more.
Use the priority setting too. Set lower clients to none and good ones to medium or high.
I have a lot of both mixed 1x1 and 2x2 on MIMO rockets with lots of customers and still get good throughput. I even have great performance on mixed legacy/M series airmax.
Could be just that I don't offer anything over 3 Mbps and or I don't have APs with high customer (more than 40) density. .?--
OptionsDSL Wireless Internet