Although I've done the 0-100kph in 2.8 before, this was with only 75% battery, on a damp road and with max battery power engaged to enable launch mode, but I did not wait for the battery to reach temperature. Was on a road trip at that point and couldn't spend the time waiting for the battery to heat up. Also did not engage the Ludicrous+ mode.
But the latter one should only make about 0.1s difference. Under ideal circumstances, I would expect to indeed get around 2.8s 0-100kph time and maybe a full second off to 250kph. If I have the chance I'll post another attempt under more ideal circumstances ;-)