Ignition help requested

Hello,

This is my first post and I need your help and experience for my bike.
I am in France so, please be indulgent with my so bad English.

I am the happy owner of an S&S 100SB with a Keihin FCR 41 race carburetor and a Dynatek 2Ki ignition module and I have no VOES

This engine is very powerful and have a lot of torque, it's pussing hard...

I have a little trouble at idle and only at idle. The rpm is varying between 900 and 1300 when the engine is hot. I think there not enough ignition advance because when I turn clockwise the ignition module, the rpm is more steady.
I try to change the curve but if I put more advance the engine is pigging when I turn the throttle.

Do you think I have to put a VOES, Ultimate engine have no VOES but they have no square engine like the SB100.

Does anybody Have the same engine and would like to share the engine curve?

I am waiting your advice and experience

Thanks so much for your help.

JP