keep in mind that as your fps goes up, 1 frame increases mean less and less for the actual time latency
for example, a 60 fps cap vs 90 fps cap (30 fps difference) gets you 5ms less latency, while 144 vs 174 gets you 1ms
also, i would recommend having the highest stable cap you can get, so you have fairly consistent time steps of polling the mouse and such, while still having pretty low latency