Just an advice: If you use launch control at the start, you should lift off the throttle for a quick moment approximately 1-2 seconds after the start, when the car stuck in a certain speed and not accelerate for a few seconds (exactly like in this video), then quickly (right after the rpm lights in top of the screen not flashing one after the other) hit the throttle. If you use this tactic, you will not lose 10-15 places at the wet starts, max. 3-5 places. I know, it sounds strange and shouldn't work, but trust me, it works both in dry, but especially in wet conditions.
Just an advice: If you use launch control at the start, you should lift off the throttle for a quick moment approximately 1-2 seconds after the start, when the car stuck in a certain speed and not accelerate for a few seconds (exactly like in this video), then quickly (right after the rpm lights in top of the screen not flashing one after the other) hit the throttle. If you use this tactic, you will not lose 10-15 places at the wet starts, max. 3-5 places. I know, it sounds strange and shouldn't work, but trust me, it works both in dry, but especially in wet conditions.