Connect a Huawei B260a to Netgear network

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Hi all,

I have a Pre-existing repeating netgear network of a WNR2200 router set up as a base station with a harddrive plugged into it as a network device (readyshare) and another WNR2200 router set up as a repeater.

I want to supply this network using Huawei B260a modem (on the Three network).

I currently have this setup;
The b260a IP is 10.0.0.1 subnet 225.225.225.0 and has DHCP turned on (range 10.0.0.100 - 10.0.0.200).
This is plugged into the internet lan port of the base station wnr2200.
The base station IP is 192.168.1.1 subnet 225.225.225.0 and has DHCP turned on (range 192.168.1.2 - 192.168.1.254)
The repeater Wnr2200 is automatically an access point and has an IP of 192.168.1.254

This setup works but the speeds are around 1-2mb slower when connected to the netgear network than if connected directly to the B260a.

Any help with this would be greatly appreciated.