I thought you get it on your own...
Because if it does average 4-5ms or even more and occasionally a lowest 1ms but also has 6-10ms highest, it is false advertising and you still probably experiencing ghosting at 160hz.
For example the LG 34GK950F is advertised for 5ms G2G response time. When tested by tftcentral, they reported: Lowest 3.8, average 8.2 and highest 16.5. As you can understand you can't do decent 144hz without ghosting and stuff with 8.2 average, but they advertise it as a 5ms anyway.