I'm not sure if this will work for you, but I'll tell you what worked for me. Pixel was the same way - TOTALLY trained with pee, but would poop on (of all things) the DINING ROOM rug! lol I learned he didn't like to poop in the same place he peed. So NOW I have 2 pee pads (actually 3 because I leave one in his ex pen too - he never poops when I'm gone during the day, only an occasional pee so it works), one for pooping and one for pee and it has worked. Maybe you could try that? It has completely solved my problem
Yep, Pixel just keeps on training ME to adapt to HIM lol