Quite a bit of facts has been presented here, but here is something that most miss out - with BR there doesn't need to be an OPR change for BR to move.
BR is supposed to introduce risk based pricing, and that means if for some reason a bank's COF increases regardless of OPR movements, they will adjust their BR. A good example is the beginning of Basel 3 compliance, where their liquidity requirements are more strict than before, thus causing a big requirement for liquid funds 3m and above. This is why you see FD rates on the longer tenure shoot up so high despite no change in OPR since July, which all the banks are desperate for more liquidity to meet requirements. If the banks are still operating on a pure BLR basis, it is highly likely that BLR would not change since they are quite tied to OPR (my memory fails me here, but I think Maybank tried to be a delinquent once and changed their BLR moving out from the other banks' BLR vicinity - they got the tap on the shoulder). However, I believe the banks were told not to adjust BR for the short term to get consumers used to it.
Note that means in a normal situation, BR will change in anticipation of rate movements since KLIBOR is submitted by banks and reflects their view on rate movements (unlike BLR which only changes few days AFTER actual movement of OPR).
Note how the huge local banks have an advantage with lower BR since they have larger CASA deposits which gives extremely low interest rates, compared to FD, hence reducing their COF leading to lower BR. Foreign banks are at a disadvantage here, having limited retail reach with branches and network.
Thank bro..