Tbh, I think you would be fine considering that one of the seven is your native language and won't really require much work from you, and that your EPQ will be done over the summer when you won't have to be worrying about your other subjects. I'd say go for it, and then if you feel that it is really going to be too much for you then you will probably be allowed to drop one of them during the year, and you'll still have more than enough A-Levels. Just remember that some universities won't accept your native language within your offer, so it will not count towards your UCAS points or the three grades they ask you for in your offer. However, this may not be the case for all unis.