You are way below bp. You will know when you hit it, the front wheel just floats and you feel like you are going to fall off.
Once you get the front wheel up a good amout, its all about throttle control. Take it slowly and bring it up a bit higher everytime. You are letting off the throttle too much so it comes down, either that or you are chasing it to the rev limiter and not bringing it high enough.
It just take time and practice, sounds like you have the basics down, now all it takes is time and work.