sorted this

had to set to to mode to HT20 which reduces its output by 50%...the reason I used these was to get 150mbit throughput...can anyone explain why please

better to use one thread for future recomendation you have now 3 threads open.
in some networks TL devices force you to use 20, and its not the brand UBNT does it too, its the Atheros Chip read post #17 here http://forum.tp-link.com/showthread.php?59935-TL-WA7210N-Channel-bandwidth-and-rate/page2

Hey, no need to see each other in fact.
Confirm that two 7510 are using the same Region, Channel and encryption, then type in the MAC address of the other one. After reboot they can establish the wireless bridge automatically.

More information

7510 implement the traditional bridge mode as same as 5210G.
the typical topology of this traditional bridge will be :
LAN_1----7510 as bridge )))((( 7510 as bridge----LAN_2 (On each unit you need to type in the MAC address of the other one)

Since this kind of traditional bridge is an old mechanism, with WEP encryption the physics layer bandwidth can reach only 54Mbps.

If you need 150Mbps wireless bandwidth, configure as below: (Due to the high wireless network overhead, the IP layer throughput is usually about 60% of the physics layer bandwidth.)

LAN_1---7510 as AP )))((( 7510 as client----LAN_2 (test it and you can get about 90mbps between LAN1 and LAN2.)

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7210 is a new brother, you can see obvious difference in its webUI when configuring “Bridge with AP mode”. It dose't need to configure both unit as bridge mode, just configure as below:

LAN_1----7210 as Access Point ))))(((( 7210 as "bridge with AP"-----LAN_2 (also, test it and you can get about 80~90mbps between LAN1 and LAN2.)

As to this new kind of bridge, the Access Point treats the other 7210(bridge mode) as a common station.