this is strange I did a bandwidth test between the two radios and get average of 17.5mbps which I would love to achieve that.
If I stick a 10mb hub right before the Mikrotik router I can download a file from one side to the other at 900-1000KB/s which is about 200KB from hitting 10mb which would be my limit with the hub there. Now if I take the hub out and put a 100mb switch right before the Mikrotik router and I run the bandwidth test I still get 17.5mbps average. But when I go to download a file from one side to the other it will only download at 150-240KB/s. Now I thought maybe there was a throughput problem before the switch but if I plug a computer up to that 100mb switch I can download at around 5000KB which is close to 50mbits.
I have also tried other 100mb switches as well. I have tried turbo and non turbo and tried adjusting acks with no luck in getting any faster.