Sounds good and very acceptable
Did you roll off any low end on the 251 ? (I am only listening on laptop earbuds) but it sounds just on verge of a tiny bit of boom in low end.
Also I think (if it were me ) Mix wise I would drop the 251 track a few db (assuming it is up the middle) to get just a bit more spread in the sound field (or not
)
Also I would experiment with the 251 in cardioid also