By starting the bidding in Hearts instead of Spades and then making a splinter raise in Clubs, some information about partners hand has been lost. So, I disagree with the Heart start. Open a Spade and partner gives some kind of informative raise. As it is now, you have 5 losers and partner has shown cover for only one loser. While partner may have the King of Spades there will be days that it is not there. That being said, with the King of Spades and the Queen or doubleton of Hearts, I expect partner would bid the slam if you show second round control of Hearts by bidding 5 Hearts. Hopefully, partner's Diamond or Club losers can be pitched on long Hearts before opponents can take them.