Your Internet speed does not directly relate to the speed of your wireless network. Where it would provide benefit would be the overall speed between the server over the Internet to your device.
Reconfiguring your base stations as bridges will eliminate the throughput loss due to NAT ... but you will need NAT to properly control access to your local network for IPv4 traffic from the Internet. With NAT completely disabled your local network would be completely exposed.
What exactly is your goal with your network and these base stations?