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Trains starting from BNC have 2 options, either 1A or 3.
Problem with SBC is 1 is used for prioritized trains like Lalbagh, Sanghamitra, KK, Udyan, Chennai Mail, Brindavan.......
PF 2 and 3 are used for other trains originating from SBC
PF 4 is majorly used for arrivals which would be shunted for Maintanance
PF...
more...

5 and 6 are busy with Mysuru Bound trains
PF 7 is used for MEMU, Passengers, Shatabdi and Uday
PF 8 is majorly used for arrivals from YPR side and departure towards Mysuru side and prioritized train departures like JS and Namma Raj
PF 9 is used for arrivals from Mysuru Side and Departure towards YPR
PF 10 is used for passengers and less priority trains like Vishwamanava

So you cannot get the same PF every time.....
Most of the trains do not get the same PF daily... Especially the ones using 2, 3, 4, 5, 6