How old are you? The reason I ask is, no matter how virtuostic your technique, you need the soul for a Chopin concerto, the maturity, the experience, the emotion. A great pianist friend of mine (I will not mention his name out of pure respect) once siad to me that one should not tackle a Chopin concerto before the age of 30, because before then, it is just far too early.... I dont think its trhe case always, but generally.