BF 10% is healthy but I'm saying I don't think you need to go that low for surgery but I'm no expert. And although weightlifting pushes out the gland I have personally noticed by chest seems to look more muscular after a workout or just bigger...then again I have a worse case gyne than you do.
i fell into the same trap - i focused almost solely on chest (dips, declines, flat bench, flys), and i only saw my chest get bigger.
i've realized the reason so many people suggest weightlifting is that it boosts testosterone levels, which in turn, may decrease body fat (the magic of T). more muscle also means less of your food intake will be put into fat (it'll be used to feed the growing muscle), so all things equal, if you eat the same amount, you'll be burning more of it, rather than storing more of it as fat.
the key then - as bay224 pointed out - is all around muscle building - arms, legs, etc (lower body, actually, results in the most gains the fastest - our legs can handle so much more weight than our upper bodies - and i've read that lower body workouts boost T more than some upper body workouts)
i wish i knew this two years ago, but i think if you have a balanced workout routine, if anything, do maybe low weights, but high reps for chest, and not focus solely on chest exercises, the T will kick in, the body will lean out, the chest won't get too protrusive, muscle in other parts of the body will grow, and overall body fat decreases. this may then help with reducing the fat in the chest (of course, no way to spot reduce it).
