It seems that there IS a difference between the B737 and B747 when posts #11 and #13 are read.
A tech log entry is definitely required if a limit speed is exceeded, even by 1 kt, but no such entry is needed unless and until there is an exceedence.
If you happen to be caught out high and fast, selecting ldg flap usually does no good because of approach (high) idle selected with ldg flap. You will usually descend quicker with gear down, F20 and speed CAC.