I wish I could fit 28's. I just ordered three more 25's to get free shipping. I am using tubes and when the bead seats there is a pop as the tube expands. They fit tight the first time and the bead is about about 5mm from the edge so it pops when air goes in the tube. I suspect that is why yours didn't seat right away.
They are fast, supple and surprising durable for a tire so lightly built. I only have one minor surface cut on the rear.