Check this tab, and see what value is in there:
And then go to this tab and set 'card rates' and something 5-6db lower to start with. Then adjust from there 1 at a time (up or down). Never go higher than what was in that field to start with. Review the signal strength on the other end until you get it around 60-62db. Then do the same on the other side.
Just a note - we have had tons of links with excellent signals, but lowering the power helped tremendously because its not driving the card so hard, or in other cases its shouting too loud at the other end.