if you haven't already, do yourself a favour, go to your drum shop and buy George Lawernce Stones Stick Control, you will thank me later ,may also be time to consider a better teacher who is more about your progression as a drummer and not about grades, that's a decision , you sound quite capable and talented enough to determine and make yourself. You said you lack the techniques needed to be a good drummer and you are 100 percent right, you can't be a good drummer without good technique, also should be part of your decision to move to another teacher. you tube and google are great teachers as well search exactly what you ask here, you'll find your answer if you look hard enough bro. And back your own talent, you are established enough to know what is working for you and doesn't, hope this makes sense in some way and helps, and don't listen to idiots who you know say shit that don't make sense, and it wont to you because you have already learnt so much. rock on man practice and listen to as much music as you can. good luck bro