this may not be accurate, but 16.fxe5 dxe5 seems good to me because it opens the file for the f rook which otherwise would need a couple of moves to sit on an open file. it also opens the d file, which white's a rook can capture quickly since black has more pieces in the way.
maybe, after the exchange, 17.Nf5 would be good. if black exchanges with 17...Bxf5, then with 18.exf5 you have a protected pawn right in blacks territory with tempo, and can push the other pawns with a kingside attack. if black avoids the exchange, your knight will be sitting on an excellent post. or you also may think to exchange your knight with black's e7 bishop, grabbing the bishop pair on an open position.