This is probably one of my favorite tricks to do on transition (terrain where in exchange I can't really seem to backside ollie right for shit), speed definitely helps but it's also very much in the timing and in how you pilot the trick with your shoulders and hips. I usually approach as straight as possible and pop as soon as my front wheels are just about the bump the coping (or even after they clip, then it doesn't matter much because all my weight is already further back on the board), and that's when the right speed helps with that timing being correct. But my shoulders are facing the ramp and I'm looking where I'm headed, so my upper body is open and all I need to do once I've popped is turn my hips on the ollie and aim for my landing spot (that's also when you decide whether or not you want to smash into frontside disaster). You bring your knees up and then you get ready to absorb your landing. Compared to flat banks where the rotation feels more like a compass, on transition feels more like a swing. Maybe actually try and pretend you're on a swing when doing them, personally I've never tried but I'm actually not kidding.
My foot positioning is also a bit different from when I do frontside ollies on flat. Front foot is closer to the center of the board and really nestled into the concave and back foot on the very tip of the tail, whereas outside of a ramp I give way less fucks unless skating something tall for me. Helps with control keeping the board connected to your feet as you go up. You know you're getting there when the top of your frontside ollie starts feeling like a catch.
One of my favorite personal mini games in all of skateboarding, whenever a miniramp is around, is drop in and then instant frontside ollie on the opposite wall, I could literally do that every day for hours and never get bored. Also think about Cardiel.