I have the opposite prob with my sami , as far as Idle goes , but I have noticed it you change the timeing it change the Idle , I have mine adjusted all the way down at the carb , and the rest I had to do with the distributor , it runs good, idles high at first but calms down after warm up ..
You might try setting your timing up a little after warm up ...
So were you suprized at what it could do , I sure was when I first got mine , and the more mods I make the more suprized I get , Now Im suprized I dont see more of them .