Ok, the SFH parameters are perfect, so I assume you are experiencing “normal” interference.
RF LOAD = 3 / 17 (# TRXs / #hopping frq) = 17.6%
The threshold is 12%.
It means that your frequencies are way too much used !! There are plenty of collisions between cells : the probablity that 2 cells are using the same frq is just too high !
How to fix :
1/ add frequencies in the MA List
2/ remove some TRX in order to have only 2 hopping TRX per cell
3/ roll back to BBH and do your FP manually.
Just for information, what is the average call drop rate in this area, at busy hour and daily average ?