Clearly there shouldnt be this movement, make sure the clip is in the right groove and is also beneath the washer you mention, that washer has a bent tab which should locate in a slot in the throttle valve thereby keeping the cable nipple securely in its place, if it isnt this could result in the movement you describe
Check and double check this main jet size, 105 is a lot bigger than 88 although 88 sounds a very odd size to me, normally they go up on steps of 5 I think