If the bidding start with 1NT(14-16) it's very likely to stop in 3NT. Most of the points in east's hand are in the side suits, no shortness, west will show 5332, so I didn't see why should play in Hearts. It doesn't make sense to go one level up and to give the opponents a chance for ruff(s). I think that the overcall must change the stereotype of east's mind, and to push him to bid NT in a prospect to protect Q♦. The four-card support makes easier to clear the suit and you have nothing to ruff.