I have a domino coming in tomorrow, after drooling over it since it came out. I was watching some YouTube videos on operating it and noticed you can make the mortise wider to keep the joints from becoming too tight.

From the videos it looks to me like even on the 2nd setting the tenon is very loose from side to side. Doesn't that really affect the strength? Does it make a full cure take longer?

Do you guys actually use that feature or just leave it on the tightest setting? Seems to me that careful fence usage and technique would eliminate the need to widen it.