Re: reeds for ottolink?
Generally with a mouthpiece that has an open facing, like a 7*, you'll want to use a softer reed. I'm not a big fan of Vandoren V-16's personally. Try whatever brand of reed that you are used to, only like blackfrancis said, I'd try a #2.
I don't like the ligatures that come with my Otto Link metals either. I've had problems keeping them tight. I use a Rovner lig that was made for an Otto Link Super Tone Master. You can order them online through Giardinelli, or WWBW.