It's not great to make rules like "When dummy has this, we always play SP. If dummy is that, we give count." It's much better to give the signals that convey the information that partner needs to know. In general, I'd say this is not a SP situation, because giving attitude accomplishes pretty much the same thing. Surely if you cashed the A in the middle of the hand looking at KQJ you had a reason. So you probably had something in mind and it was either to continue playing the suit hoping to give partner a ruff in that suit (in which case he encourages) or you need to play something else (in which case partner discourages) and it should be obvious to you what to play. If you're cashing aces because you don't know what else to do in the hand, I suggest worrying less about signals and more about defending in general.