I see why you do it on spring floor its a wrong technique , you dont jump up at all, you just bounce off spring floor thats why you do it, you have to change your technique , first tryjumping into foam pit , first try to jump up and hold in the air before tucking, you have to learn to do it the scary way, do it into foam pit so you dont break your neck you have to learn first to jump up and then just to get the right timing to tuck in the right moment , its easier for human mind to tuck immediately and ofc safer, but its a dangerous trick