Lol, you forgot the "h" in Ugh.
What I meant is not when the Specs gets Tricked to me, but where the boost comes from. Choice Specs gives you a 50% SAtk boost, right? Suppose you use a move to get a +1 in SAtk. Then the Specs gets Tricked. Now, where would the 50% boost come from? My original SAtk, or the +1? Look at my scenario in my question.
However, you answered my question anyway, just in a more indirect way. The boost comes from the original SAtk.