I would put it back in a well draining cacti mix and add a lot of pumice. The root system of jades are such, very small mass. Watering once every two weeks in your area is not bad, since there is too much humidity in the air. That is actually what jades hate..too much humidity. Nothing much to do about it, since it is a given tropical condition in Southeast Asia, so good airflow all over and fast drying mix is what you can give your plant.
When you repot, do not water right away, give time for roots to adjust again. Since you have seen how small the root mass is, use smaller container..maybe more wide mouth than deep containers, and improve your media.
No fertilizers, just keep it warm and dry for now. and water only as needed. It still needs watering, since it is a live plant that needs also moisture replenishment..but when air is too thick and heavy with moisture, it is making it more difficult for the plant, so leaf rot ensues faster.