It takes practice to make a good manual

Get more speed

It might be your wheels or bearings.

Hope it helped

If not sorry it really a teacher

You’ve got to balance it out so you don’t loop out and you don’t lean forwards so that u are riding again so yea balance it out

Use as much balance as you possibly can and use it to determine how for you want to go. Once you have mastered your balance try to do it with as much speed as possible to gain maximum length of your manual! Hope this helps, my guy!! 🤟