There are several ways you can work for TBF Drop.
  • Check frequency in BBH and the retransmission rate in those cells. if high retransmission --> for sure there is problem on Frequency. Improve C/I (reduce interference)
  • Try use most BCCH TRX TS for PDCH
  • Make sure (E)GPRS link adaptation is enabled.
  • If frequency change doesn't get good result limit the (E)GPRS coding scheme up to MCS7 instead of MCS9. MCS7 is more robust than MCS9
  • Reduce no. of users per PDCH
  • Check PCU congestion/Utilization

Discuss here for further solution.

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