No, send STS until he considers you, you won't need HVS, unless someone else is in the picture. You pulled him when he is considering you. In DII, I needed 31 once. So the thing is you go : STS X 10 + scholarship, you check the reaction... if it says close, you could go 5 the next cycle. If you feel it's not in the bank, go 10 STS again... repeat until you see considers you.