Hey welcome to the forum, I'm guessing you know most of the body weight exercises. But here's a nice thread to help you out and spice up your routine.

http://www.saddoboxing.com/boxingfor...xcercises.html

Well you will get a hell of a lot fitter if your doing tabata's 3 times a week, if you hang around here for a while you will realise it's my favourite thing . With the pullups and chin ups maybe start with some isometric holding at 90 degree angles for time. Each week try and improve until you can do those pullups. Also consider trying to do handstand pushups by gradually icreasing the angle of your feet in the air to build some upper back/shoulder strength.

On the technique front, just practise practise practise. I find doing it slowly to start with and perfect technique helps me learn things much more effectively than just wailing on a heavy bag or trying to go flat stick in shadow boxing. Also practise your footwork, day in day out, you want it so you don't have to think in there. When the guy charges you, you instinctively just hook and turn. This is where balance comes in as well.

So ineffect just keep practising the basics until you master them, your never going to be beaten badly if you have them downpat. Hope that helps.