Startzones, "Lags", and Moving Forward

Numbers on cs:go for fun:
-323.00 with cj
-316.75 without cj

sqrt[ (350)^2 + (-323.00)^2 ] ~= 476.265 units/s with a crouchjump, or
sqrt[ (350)^2 + (-316.75)^2 ] ~= 472.049 units/s without a crouchjump.

with the common "false start":
-335.50 with cj
-329.25 without cj

sqrt[ (350)^2 + (-335.50)^2 ] ~= 484.830 units/s with a crouchjump, or
sqrt[ (350)^2 + (-329.25)^2 ] ~= 480.526 units/s without a crouchjump.

The problem comes with detecting if something is a false start or not, on stages where these numbers are different. Otherwise this could just restart the player to the start of the stage if the timer detects a false start. Or add a tick to the time.