The CLR is the point on a hull around which the hull will pivot in the water. With centre boards it is actually an artificialy induced pivot point (by the boards). If the centre of effort of the sails (the combination of all the sails) is in front of the CLR then there will be lee helm, in fact it only has to be a very moderate way in front to induce quite large moments of lee, but due to the resistance of the rudders to sides way movement (the larger the rudders the greater the sidesway resistance) the C/boards and the rudders act together to counter the weather helm as the centreboards are positioned further aft, so there is a quite large degree of latitude in the positioning of the boards aft. The further aft the centre boards and the larger the rudders (within reason) the higher the hulls will go to windward. If the balance is right with sloop rig and then a spinnaker is added the theoretical result would be increased lee helm, but in practice, with most cats today, due to the low resistence to forward movement through the water shape of the bows (fine entry and relatively deep bow), by depressing the bow deeper into the water, this tends to counter most or all of that increased lee helm.