Your saddle position may be the problem. I recently found out that I can get my bar about 5 cm lower and further away than I had it, but only if my saddle height and fore/aft is EXACT. Just being off by 5mm made a shocking difference. (Being too low and/or rear was preventing me from getting into the more aggressive position.) Also need to make sure hips are rotated enough -- which that proper saddle position will more easily allow. (BTW, my proportions are nearly identical: 6'1", 91-92 cm inseam.)