I had a larger than expected enrollment and a number of students who entered the classroom late, so -- after some confusion in setting up groups -- I ended up developing groups that have 9 or 10 members (instead of the consistently suggested group size of 5 to 7 members).  I realize this isn't optimal...but I'm leaning toward leaving the groups like this.  
 
They worked well together in determining the grading distribution today, and already seemed to begin the bonding process in several obvious ways.
 
Does anyone have experience with TBL with larger than optimal groups?  Should I leave things as they are for this year, or make a change before things get to far?
 
Thanks--(clearly I'm a TBL-newbie!)