Can’t do em. I can frontside ollie and back disaster but for whatever reason I always either undershoot and barely get my wheels on the coping or I kick out on front d. What’s the trick
Depending on what there is to skate near you, very small or mellow transition or the lip of any average bank is a good place to start and then really get them consistently, so if you can frontside ollie on the face of any of those, as well as frontside 180 on flat you are already there. Just make sure your frontside 180 on flat is all the way round, not just 90 land front truck and pivot the rest. If you do this with your front foot over the front bolts too, this will put you in a much better position to land and then lift in correctly on a ramp.
I would also recommend you go fast enough to frontside ollie right out of the top, so you are landing clear on the platform and practice that for a while, just so you get your balance to get right out, because if you are undershooting, this will help with that too.
Once you have the right balance and turn without kicking it out, try to land right up on the deck, so your front truck is almost at the coping, rather than the back truck only just being over, which will also help with getting comfortable to take them in.
After that it is just getting more of an ollie up and then turn around, so you can get them round far enough to deck them but keeping weight in the ramp so you can roll away more easily.
Sometimes the best way to see what is going on or where you are balanced is set up a phone or camera and just rewatch the makes and bails. More often than not, if you are not turning your shoulders round far enough or standing up too tall, it will cause you to lose balance, so stay low and make sure you move your upper body before your lower body.