distributor recurving ?

I need to re-curve my distributor so that I can gain more initial advance with out gaining more total. Right now I have 18 initial and 34 total. I think I really need another 4 to 8 degrees to clean up my idle. Is this something I can do or do I need to send it back to FBO for another re-curve ?

Right now I have a idle speed of 1000 to 1200rpms in neutral. To get the idle this high I had to crank the idle screw on the carb all the way in. The carb is a custom built Thermoquad. It will be going back for a bit more work but Im sure my timing isnt helping.

This is an 11:1 340 with a 260/265 @.050 solid cam.