I'm still fairly new and not as smart as ya'll seem to be but I did play, and I emphasize the word play, with some Confetti.
I only wanted to try and trait some up for fun and luckily that did work well, but then again I started with good stock.
Along the road I saw that this was a never game to get a nine traiter. Never in the sense that It'd take more time than I would give them. I never sweated the details much and enjoyed them, only stopping breeding them because I don't sell them and have a ton live that need my attention. I sold one mega which I regret actually. That was a 4T Lime...ugh.
Anyway I feel your pain and anguish, not through my Confetti experience but while making other cats that omg just never, after even generations, give me what I need. It seemed to me that Confetti are the ultimate game to play in Kittys.
I don't know much as I said but maybe a 9T would need some newer more recessive traits to pull the old stock traits.
Like having all that dominant stuff banging heads is not going to get there.
If anyone ever does get there I would love to see you make it ! Hopefully a change comes and you make that nine

Best wishes