If you move the upper shock mounts to close together you will not get the latteral resistance you need to keep the bike from feeling tippy. You need some latteral resistance or when you go into a corner, especially on the brakes the bike is going to want to roll over away from the corner. So moveing the upper closer together is not a good idea, the upper shock mount needs some leverage to help keep the bike level. Move the lower mount outward to gain the same effect you are looking for, basically you want to lay the shock over to gain travel and work the shock more. Let the shock do the work, not the rider.