I think the sound from the double flange is the best but the small double flange didnt fit that well so i did this.
Cut the back flange (NOT THE STEM) off the large Bi Flange, the sq is great with this tip and i don't have to worry about the back flange being too big to enter the ear canal.
I dont have to insert them far for the seal so i dont get any itchiness.
The advantage is i get the sound characteristics of the large bi flange tip, but the ease of fit of a single flange.
Update, still too large for my ears, got sore after a few minutes. It was still worth a try.