To answer your question about pans-ops differences, I found this in the Jepps:
PANS OPS —
indicates that the State has specified
that the approach procedure complies with ICAO
Document 8168, Volume II, First or Second Edition.
PANS-OPS3 —
further indicates that holding speeds
to be used are those specified in ICAO Document
8168, Volume II, Third Edition.
NOTE: For applying the correct holding speed, refer
to the respective State RULES AND PROCEDURES
page.
PANS-OPS4 —
further indicates that the acceleration
segment criteria have been deleted, as formerly
published in ICAO Document 8168, Volume II, First,
Second and Third Editions.
NOTE: Acceleration Segment criteria published in
previous editions of Document 8168 are contained
in Appendix 1.
PANS-OPS5 —
further describes APV and VNAV
operations, ACAS procedures and CDFA including
vertical path control methods.
I don't know enough about Terps so I can't help you there, except to say that circling minimum and radius is based on circling speed, not aircraft category. I would assume the 165 kts is because of the tighter turn radius required to remain within the circling area, and if I was circling using Terps procedures I would be using bank angle 30° as well.
No doubt someone with more experience with Terps can enlighten us all a bit more.