They are close to that 20% variance, Denise, though I wouldn't want to hang my hat on that. Wonky numbers, that's for sure. Want to just say it is was a weird day and see what tomorrow brings?
I don't think we know. Robin may be right with the lower dose or a higher one may help. I think I would vote for lower since, even with the 20th variance, he is surfing, not going way up.
I would suggest you get rid of the dry food asap. No idea if that is what is messing him up, but if he is getting downstairs and eating it some days and not others, it will make a spreadsheet look completely wonky.