What we do everytime is, 4 guys go to B apps with the bomb, one goes A ramp. 4 of us wait at beginning of B house and wait for the A guy to do some sounds. His job is to throw a smoke on ct, flash 2 times, try to get a kill, basically bait the CTs. Often we hear a CT rotating from short and that is the time when we push. Or, one CT pushes the B house really deep and he gets annihilated by 4 glocks and that is a go sign. After you plant the bomb, hold good afterplants.