At a loss over this poop…. Have seen avian vet!

TLDR: My pigeon has had sloshy/wet/inconsistent poo since I got him just over a month ago. He has never done a healthy brown/white nugget like my other pigeon does. Crop & faecal were done before I adopted him, as well as treatment for common aliments. After no improvement once he’d settled in, I took him to an avian vet, who has said his bloods don’t show anything worrisome & has ruled out kidney or liver issues. What could I be missing/doing for this to be happening?

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Photo's attached.

I adopted a pigeon just over a month ago & his poo has been a green wet slush from day one - sometimes they’re super wet and other days they are firmer, in which case I get my hopes up that their improving, but they don’t. When they're really bad... he literally sounds like a ketchup bottle squirting. I initially thought that is was stress from moving and the fact that he was being picky with his food, but he eats well now & is active and happy (besides the fact that I can’t literally LIVE inside his cage with him). Crop & faecal were done before I adopted him, as well as treatment for common aliments. His seed mix is good & contains all seed recommended for pigeons, he has pigeon grit, & he has been having probiotics in his water as I was recommended.

After seeing no improvement, I have taken him to an avian vet who did another faecal as well as a blood test. His faecal came back with very minor (dead?) roundworms, which she treated him for. The only thing that has changed since this is he is no longer pooping every 5 minutes. She said that his bloods did not show anything of concern & has ruled out kidney or liver issues, and did not specify a cause, condition, or anything he needs to be treated for. I have attaced the results because I'm not quite sure what to make of it.

My other pigeon, and even the (suspected unhealthy) rescue I have quarantining both have perfect poop, so I'm not sure if it would be something I personally am doing - but want ask if there is something I could be missing or doing that could be contributing to this.

Other considerations: - INDOOR only. - Hygene is good, his cage is cleaned daily - I honestly think my daily cleaning routine is what most people would consider their 'deep clean'. - I only use F10 vetinary cleaner. - He is offered a bath & spray bottle shower everyday, which he usually opts for & enjoys. - Food & water bowls cleaned AT LEAST daily, but usually both morning & night. - He is active, loving, and happy (IMO), I don't see stress being a factor. Apart from the fact that I can't literally be with him 24/7 or live in his cage. I've been on holidays from work so he has been out for many hours each day. - Temerature always comfortable, has natural light during the day but not in direct sunlight unless he's out and wants to sit there.

Any help appreciated :D I will of course consult my vet again if I don't see an improvement over the next few week (but not sure how I would seeing as he hasn't been treated for anything).