PTP Bridge low bandwidht problem

Hi,

I want to make a PtP bridge. I want to replace 1 physical cable.

Here is the plan:
[UPC modem]—[MT1 / SXTG-2HND 10.0.0.1/29]~~~~~[MT2/ SXTG-2HND 10.0.0.2/29]—[Linksys router]…

Here is my settings: http://pastebin.com/Avvw9h7V
The connection is ok, but the ping are (50-200ms), but if i try to copy between 2 windows machine the max bandwith are max. 280K/s - 480K/s
This is test connection now. AP’s are see each other.

What i test, but not in the config file:
nv2 - client can’t connect to the AP - no reason…
nstreme -connection is ok, but not faster
TX power mode changed to card rates , and has been set up 1dBm-re (just for test) did not get better…
Can anybody tell me what I screwed up? Router os 5.25

Thank you,
Sz.