with just the stock replacement K&N, unless you modified the stock air box you won't see much of a change in the mixture.  Although from the factory the mixture is set up lean.   The mixture screw you messed with is just for the idle/air mix,  it's not gonna help out the lean condition very much if at all.  In the Tech section there are a few posts on how to re-jet your bike properly.

R.F.

I think I will just leave everything as is. I have rejetted the carbs and synced them on a Yamaha 650 because I had put on Vance & Hines short shots. It was a Cass County trike conversion. Got tired of the noise and sold it to buy my Suzuki S40. Kind of like the quietness for a change. Found out how much of a pain changing main jet was. Could not get main jet back in and had to take top of carb off to hold the part inside down while I put main jet back in. Involves removing gas tank of course. In my case I had to empty the tank and take off petcock to get tank off. Pain in ass.

At least if you have to rejet you now only have one carb.