you need to ensure that there is not too much overlap between cells whan appliyng SFH 1/1.
What is the average number of TRX / cells ?
What is the number of frequencies you put in your MA list ?
Did you ensure the HSN was the same within cells of same BTS, and different between cells of different BTS ?
Did you check your MAIO planning ?
What is the cause of intercell HO ?
What do you see during drivetests ?