My thinking is to put his shoulder joint in line with the head tube, still behind the fork so stability should still be good. Either a forward seat post or merely pushing the seat forward. Seems a bit back for TT'n IMHO. Then he won't seem as stretched out in the front, and steering will improve. the knee seems to be a couple inches behind the ball of the foot so moving the butt forward will put the knee right over the ball of the foot from the looks of it. Flat back of right or down for TT?