Absolute beginner on the forum and in regard to cat parenting - please be kind

I need some advice and was wondering if anyone could help?
We have recently adopted a small, black kitten from the local shelter - KiKi.
We fostered KiKi initially as she was suffering from a URI and conjunctivitis and needed to be out of the shelter. Hubby and I immediately fell for KiKi's charms and the rest is history; as they say!
Realistically, ever since we brought KiKi home, she has had loose bowel movements. Initially, we were given Fortiflora to help with this along with the cocktail of other medications she was taking. She has been de-wormed and was given further meds at this point by the vet as she had some anal discharge.
Once the prescribed Fortiflora ran out, we continued without it. Stools have since ranged from watery cow pat (sorry - gross) to toothpaste type mounds - soft but kind of formed. All, light brown in colour.
After spending hours online researching poo (again, gross), I had over the last two days introduced soft, natural pumpkin into her diet and stuck to one brand of wet cat food. All seemed to be going well in that her poo colour changed from light brown to a more natural, darker brown and there was less of a stench, too. However, I have just fed her and almost immediately, she passed a stool that was very wet and accompanied by some loud (and somewhat comedy) farting noises; which, actually alerted me to the fact she was going to the toilet!
I live in the Cayman Islands (I am British) so KiKi has been eating Friskies and the 'shreds' type rather than pate. She is only on wet food. She likes to eat so, admittedly, I gave her a fairly large portion of food in regard to the last feeding mentioned above that lead to the toilet trip. Another point I need advice on, actually.
So, looking for help as follows:
1. Any advice in regard to the loose stools?
2. How much should I be feeding KiKi? At the moment, she is eating around 8.25 oz of wet food, a day, spread over 4-6 meals. She currently weights 2.5 lbs.
MASSIVE thanks in advance
