Hi andy,
I’m not so sure, but I think you have to tune parameters THR_FR_LOAD_L_xx and THR_FR_LOAD_U_xx (where xx=SV1 or SV3). For example for the cell with 4 TRXs THR_FR_LOAD_L_SV1=40 and THR_FR_LOAD_U_SV1=70 (it depends, check help for those parameters).
Regards,
Rex