Agg, mention the loss of an engine at 155kts and continuing the flight. That is 5kts below V1 with flaps 20 and 10kts below V1 with flaps 15. If the engine failure is recognized prior to V1, it become a rejected takeoff, end of story. If the non flying pilot states "Engine Failure" prior to calling "V1." It is an abort.
One thrust settings flaps 15 shows 102.8 and flaps 20, 104.1, not much difference. Both well below max thrust. Flip a coin!