Your wireless repeater has wireless bridge function and extends your wireless range. What is the signal strength to the repeater?
What is your router? As I ask previously, did you test your wifi speed right next to your router?
The signal strength to the repeater is something like 40-50%.
My iPad get's like 25Mbps down when sitting right next to the router. The router is a Netgear that I got like last year.
Another thing I can't figure out is why the range on the 5Ghz network is so weak. You basically can't detect it unless you're on the same floor as the router. I even turned it from 300Mbps mode to 145Mbps mode.