Worst cells cannot be the same everyday because traffic vary so handover too.
I insist on the fact that U need to check deeply your frequency planning .
Others check can be done on:
1) The enabling of MS/BS power control
2) Other handover causes are well defined : better cell , handover on rxlev, etc..
3) Overshooting cells;
4) Cells suffering from Path balance, TMA issues, rural coverage etc..