Interference with Licensed 900

Looking for some help or guidance from anyone that has dealt with this before.  We are operating several towers using 3 120 degree sectors of  PMP 100 in the 900 MHz range, using 906, 915, and 924.  Two towers have licensed equipment using 901.1125 and we are causing issues for the equipment with our 906 APs.  I installed an Allen Avionics 917MHz ISM Band Cavity Filter.  When the AP came back up, I only had 6 of 16 SMs come back.  Signal level wise, some of the SMs that did not come back appeared to have as good of a signal as the ones that did come back.  

Any help would be greatly appreciated!