You should try Edging (jerking off for 2 hours or longer while keeping yourself as close to the edge of Cumming as you can before you finally let yourself Orgasm) it usually results in bigger Cum loads and a more violent spurting. For me if I just do a "quickie" and jerk off for like 20-30 minutes and then Cum I usually spurt 6-7 times and my Sperm will only fly like half a foot up in the air. But when I Edge my load contains roughly double the amount of Sperm, so I will spurt 10-14 times and my Cum shoots out as if fired from a cannon! Usually going 1.5 feet straight up into the air for a few of the spurts, I've even had it fly over 3 feet into the air on occasion. Like about a month ago when my Cum flew above my head and landed in my hair.