when it comes to rails with 2 or more kinks, especially down-flat-down rails, I find myself with a lot of speed on the down section of the rail and then flying off the flat section.
is there anyway to control my speed to stay on the rail?
for a dfd make sure u dont haul ass into it or you will fly off the flat like you said. something that will help is look at the end of the rail when your on it, a little tip from dylan natale when he was coaching me. also if the kink is real sharp u may want to suck up your legs a little when you get there to absorb the kink. some of my friends have a hard time with kinks and for them it is a problem with commiting 100% make sure you go for it man. hope that helped a little and be safe like turpin always says
you need to absorb the first kink has much as possible ,by bending your knees and upper body through the first kink them you need to push down the second kink . try it whit a minimun of speed so you have time to see what you are doing right or wrong.