G and J, let's separate their roles. G should keep the unaspirated sound, like in "gato," "mago," and "águila," and J should keep the aspirated sound, as in "jarabe," "jirafa," "gente," "argentino."
Ge y jota, dividámosles las funciones, que a la ge le quede el sonido suave, "gato", "mago", "águila", y que la jota retenga el sonido áspero, "jarabe", "jirafa", "gente", "argentino".