JaOM recipe was designed to mimic what ancient people did (and had to work with). It is also a simple way for beginners to start or for people who cannot get exotic wine/ale yeasts.
If it is too sweet, add more water/less honey or use a wine yeast.
You can remove any sulfates/oils from your raisins by rinsing them with warm water until the oils are gone. Say 4 times.
It should be much tastier after it has aged 3 months