MKT should have been clearer in my comments, sorry.
MS may use different BCCH ARFCN in dedicated mode as oppose to idle mode. Did test calls show the BCCH ARFCN with lower RxLv being used and if used what was the RXQual for these?
I ask as I have a similar issue.
Pix agreed GSM 03.22 and 05.08 show C1 and C2 criteria for idle mode.