Part of the problem is the way the spine-hip joint is constructed in most Poser figuresall of them are swaybacked! You can correct this by bending the figure forward at the waist about 5 or less, rotating the whole figure back to vertical, and then bending the legs back to vertical. This flattens the curve of the lower spine (and incidentally, rotates the hips into the proper position for good upright posture. Bending the figure at the waist now produces a proper spinal curve and the big glute problem is lessened. You still have to do some work, but it's much easier from that point.