...they came from the breeder on Iams kitten dry, should i do a slow switch back to that and see if that corrects the problem?...
[Just as a btw, before I knew better, I fed Iams Kitten and then Adult. When I moved to Orijen (grain-free) I did it very slowly with success. After a few years, I tried moving from Orijen to the Wellness Core - again, slowly, but there came a point when almost everyone's stools went runny. I gave up at that point
and returned to Orijen. In retrospect, I believe that, had I continued the changeover, but, on an even slooooower schedule, it would have worked.
I would not go back to the Iams product if I were in your position. But - I'd return to using a little of it....here's what I'm thinking:
The easiest, quick solution for you would probably be to go back into your changeover schedule....perhaps, over a couple of weeks, gradually get yourself up to about 20% Iams....all the time watching the stool output. The day you see suitably firm stool, level off. Stay with that ratio for a few weeks, then extremely slowly, start reducing the Iams again until it's 100% Core. How long will that take? Dunno...but, I know I wouldn't rush it at all. I also think you'll need to keep a record of amounts and results.
All of that said, I'd also recommend you begin an introduction to wet foods.
If he is being free fed, I would try feeding meals 3 times a day.
The generally recommended regimen for kittens is that they have free access to food 24/7/365 during their first year.
Haven't heard too many positive things about the new formulas. It's pretty much just a marketing ploy.
There are some minor differences among all formulas. There is a major difference in two: no fish
(Indoor, Turkey-Duck). There's a significant caloric difference in two - about 100 kcal/cup fewer
(Indoor, Turkey-Duck)...and, those same two have a little less protein content. I'm using the Turkey-Duck - for its purpose, I'm happy with it.