The common TC's I use are the following:
128 Heading out to patrol with no contacts (depends on area and date)
256 Heading in from patrol with no ocntacts (depends on area and date)
8 Moving to or away from a contact I have no interest in (friendly / neutral)
As soon as I even think there is gonna be trouble I play at normal speed
So far this setup has worked well for me and I have yet to run into trouble using TC and not detecting target or being detected.