Do you really need faster rubbers? You are still very young, and i do not think the level in England in u15 is crazy high, but maybe im wrong and you are very good. I also think Tenergy is already pretty fast, i would understand more if you had old worn out rubbers.
I do not trying to be rude, but what i am trying to say is that if you still developing your technique i think you can really limit your possibilities to develop your game if you boost your rubbers. Maybe you will win some more points now but i think you will become better in the future if you play with a little slower rubbers. With slower rubbers it will be easier to learn technique, learn to play hard with the technique and not the rubbers and put more balls on the table which equals more times you will practice each stroke which equals better developement. If you have trouble killing the ball maybe you could try to come out more from the table and use the body more.
I do not think i would give this advice to older players, but you have the future ahead of you, and have the possibilites to become really good since you already play at a national level at this young age so i think you should think this through. When i was your age everyone speedglued and i think i would have become a much better player if i did not speedglued. I am also a part time coach and have seen alot of players with to fast equipment and how this limit their chances to become better because it is harder to learn the proper technique.
But of course you should do exactly what you think is best, and your coach proably know you best, what you should do or not do so i think you should advice with him her before taking any decision.
