I believe that the gear has not been yet fully tested being retracted whilst at extreme angles of attack. I.e. at the moment they prefer nice straight and steady climbouts to do it.
If you look at the A340-600 display, they rotate to maxiumum pitch attitude and then very quickly roll on a lot of left bank, whilst retracting the gear. You'd only do that if you have 100% confidence in the operation of the gear.