you just need some seat time my friend.
with like 10-15 more passes youll be down into the mid 15s for sure.
i ran 15.2 bone stock with 16in wheels...
invest in smaller wheels and see what happens.
remember that building a car shouldn’t come from parts it should come from deep inside your soul. let the car speak for all the emotions, memories and experiences youve made and the car will take a life of its own. truth over fame.