throw the first scooterflip hard, and try to keep the same motion for the second, either taking your hand off and putting it back on, or just doing it all one handed.
double backs
kick it as hard as you can with your front or back or whatever, and just constantly tug the scooter in the opposite direction it is at during the rotation.
oh yea i love these tricks like i can do backflip tripple scootflips im gooood. jk, i have no advice for you cause i suck ass, sorry. and thats crazy like double bri late whip wtf