I tried the milk washer mod myself and found the same problems as you. Too many and it rocks and not enough then there is no benefit. I could not get a perfect balance.
Between the two boards there is three pads for the dob to move on. I simply added three more so there is now six evenly spaced around the base. I did this not long after I got my scope and it has worked really well so far. Just cut some old smooth plastic and double-sided tape it down.
