Try an O.S P3 plug They seem to give the most consistent iddle Imo and they're more durable than Nova/RB and Odonnel plugs (You also pay the price lol but they're worth it!)
Make sure your iddle gap isn't too small I've seen people twisting needles all day long only to realize they hardly had an opening at iddle lol
Open the Hsn and Lsn about one full turn from where you are now, increase the iddle gap untill it will iddle with these settings put the car on the track and run it for a couple of laps lean the Hsn until your engine is making good power down the straight by this time, your iddle will probably be very high lol adjust the iddle to the point where you have about a 1.5mm gap then tune the Lsn from there