Hey! Cool deck. I love Doran, really interesting commander.
I've built him myself so have a little experience with him.
If you are looking for cuts, my advice would be:
Take out most, if not all, creatures with defender. There are enough good creatures that have low power and high toughness without having that limitation. In my experience, they're usually not worth it. Creatures with low power and high toughness tend to have a relatively low cmc. As such, this deck can make a really aggressive start. Having to wait around until you find
Assault Formation or similar means you can't make the most of your potential early
aggression. Making this cut also allows you to remove a lot of the cards that allow your defenders to attack like
Animate Wall and
Rolling Stones.
Assault Formation is good redundancy for Doran so is worth keeping.
This deck tends to be very cheap in terms of CMC, so you could probably comfortably cut a land. I'd cut
Dark Ritual too. Black seems to be your lightest colour and almost everything is really cheap anyway so it probably won't provide too much benefit too often.
Personally, I think you may be playing a few too many boardwipes for such a creature centric deck. Doran decks tend to fair pretty well in combat. Your creatures are usually bigger than your opponents so tend to stick around. Definitely worth running a couple, but I think you could safely cut one or two.
I'd probably be tempted to cut one or two equipments too. In my experience, they can be a little redundant. Your creatures are most likely going to be the toughest anyway, so you're probably better off focusing on things that mess with your opponents rather than the slight gains that come from those. Things like Slagwurm armour are great because they buff is so huge for the cost, but I would personally cut at least one of either
Spidersilk Net,
Cathar's Shield or
Ensouled Scimitar, depending on your meta and if any of the keywords they provide are relevant.
I hope this has helped, or at least given you food for thought. Whatever you decide, I hope you have fun with it. Doran is a really interesting and fun deck in my experience and I hope you get the same joy from it.