I’ve been having trouble with similar issues, and in looking at your blueprints, it appears that your “Lower AA” piece wouldn’t do anything to the game settings because you never use variables from the Game User Settings. The “Lower Resolution” piece doesn’t reference Game User Settings at all, but that appears to be intentional based on the “Apply Res” piece.
What I would expect to see running this is that pushing LowerAAButton does absolutely nothing, and ApplyResButton will lower the screen resolution iff LowerResButton was pushed first and the resolution was not already at its minimum, but the string “saved res” will be printed regardless.
So, what you need to do is make the LowerAAButton use a variable from Game User Settings, but if the ApplyResButton isn’t working either, then that doesn’t solve your problem. You should probably rephrase the question anyways, though, to make it more clear wherein the actual issue lies.