1. I bid 2♦ instead of 1NT 2. After bidding 1NT I compete with 2♠ not 3♦. If I am going to play in a 4-3 I'd rather do so at the 2 level in spades and take the heart tap in the hand with 3 trumps. Also it is more tempting for the opponents to compete with 3♥ over 2♠ than over 3♦ 3. After bidding 1NT and 3♦ I double 3♥. This is MP, they are vul and on a 8 card fit, we probably have the majority of the HCP. +200 will be a top. I ran a DealMaster simulation and 3♥ is going down about 70% of the time. I'll trade 7 tops for 3 bottoms any day.