I suggest you try a Sprint Booster along with a CAI. Neither can make the claim they make a lot of horsepower and in fact, the Sprint Booster only changes your throttle response rate but I can tell you, there is a very noticeable difference in throttle response which is really what you may be lacking. Peak horsepower is one thing but when it comes to seat of the pants impressions in daily driving scenarios, a Sprint Booster along with a CAI will help throttle response be more reactive and instant.
In regards to a S/C, if you had mediocre impressions, I feel it was not properly set up as they give an instant seat of the pants impression with every throttle change.