Interesting thoughts. I think as you say, since there are 8/9 other players who will see this, you need to have a good knowledge of how each one will respond to that bluff and how much of the entire hand they will recall and possibly use against you later, you must also keep this in mind at all times during hands against those opponents.
I often think people simplify things like showing bluffs and just justify it to themselves as "advertising" or "creating a loose image" rather than remember how they played the hand also and using this to their advantage in the future too.
As a general rule I very rarely show anything when playing, bluffs or not. I think unless you are extremely in tune and know exactly how it will affect each of your opponents mentality against you that you are better just not giving away what is still at the end of the day free information.
