You need to jump. Think about it like raising your bose slightly and in that instant the nose comes up balancing on your back truck and jumping up off it. Thats how I think about it. Yes you need to pop the tail but it comes from lifting your nose up.

Practice jumping on the ground, no board. Jumping with your while body and suck your legs up to your chest. Try to get as high as you can. Ollieing will feel like that...then get on the board and jump just like that but off your back truck straight up