What is your setup on the customer end ? Any idea what the link looks like without the smart panel ? Are you in FCC land , what kind of power you set at ?
Really curios here. Using ePMP 2000 radio/sector without the smart panel and using Force 200s on the customer end I can only dream of a 20 mile link. My max link with a Force 200 to a 2000 sector is just under 8 miles with -72/-76 SNR of 22/23 and MCS of 12/12 using 5210 in FCC land so max 20dBm. Using 5200 so only allowed 20dBm power here in FCC land but still, holy cow at 8 miles you have -49 !?
Using Force 200 on both ends for a PTP link (though using DFS freq so reduced power) at just 11 miles I can only get -66 (though my SNR is 35 and MCS is 15/15) so -53 at 21 miles on a sector blows my mind.