HW4 and A16 isn't good. 700Kh/s isn't worth much if half are bad. HW needs to be 0.
Could please explain to me what "HW4 and A16" is and what I should change?
Keep lowering your clocks(core in particular) until you get HW 0. They way I understand it, HW = errors and A is accepted. You showed Accepted as 16 with 4 errors. Out of 14k Accepts, I have HW1.