The secondary throttle will open the throttle plate when the throttle is more than 40% open, it actually has a locking gate in the mechanism, there would be no change at idle speed at all.
The dashpot has a slow release valve in the vacuum pipe, it works by "holding" the throttle open for a few moments after you have let go of the accelerator. You cannot test it at idle speed with your mouth. You need the slow release piece in the vacuum line for it to work.
The choke breaker is only activated when you start the engine with choke pulled out. It opens the choke plate slightly to let air in otherwise the engine will stall. Testing for rpm change is not valid on this item.