You could try to lower your idle, or give more fuel on the LSN( low speed needle). But I would say this, do a 1/2 turn on your LSN counter clockwise and try to start it up. If you still have the problem left ,try 1/4 counter clockwise on your LSN. It's all about tuning, I know it should be tuned at factory but sometimes it's not the best tune.
Keep the faith up, it's worth it.