Interestingly, some Chinese VIP squadron chaps with whom I was working in the sim some years ago all had comparatively different approaches as to how a deadstick should be conducted in the 732 ... all got in very nicely from an initially good height/distance ... somewhat disheartening for those of us who are only mere mortals ...
Although I have not been involved with the 732/3/4 for some years now, my recollections are that 15 at 15 will give you a rather high key circuit to massage. I think I would prefer to glide to an initial maintaining something closer to 2 miles per thousand .. slow and dirty I know I can do better than 1 mile per thousand to lose height .. that being about the best I've seen (without sideslipping) with residual thrust... then, again, having seen it done successfully every which way by my Chinese colleagues .....