Steve - Thank you for the thoughts there. I changed the distribution to Gamma with default link setting. The distributions of the residuals do not look different, but they are tighter around zero - most with the +/- 1 range. There were a couple above +1 (1.56 was highest), but I could not see anything in their raw form that would justify removing them. I think we can proceed with this fit and be comfortable with the outcomes.   I appreciate both of your comments here! ... View more