With Mod 7, Bluff's cool-down was changed from 10 seconds, to 6 seconds. Unfortunately, a similar change was not made to Improved Feint. So now it actually takes more time to use multiple Improved Feints than Bluffs, which is really not how the feat is supposed to function. That is to say, Improved Feint should allow one to make a Bluff more often, not less.
So, I have two suggestions.
Improved Feint should reduced down to a 6 second cool-down to match Bluff.
or
Improved Feint should function like the "of Deception" effect.
Anyone have any thoughts? Or different suggestions? Feel free to comment.