The problem I have, is the sense that your decision for a slanting style is based more on an arbitrary decision to do this. I would feel better if this was more of an instinctual gut feeling by you that the tree is a slanting style trying to get out. I don't know if you, or anyone else for that matter, has a clue what I am talking about----maybe even me, but; bonsai is not like making a cake where you follow a recipe from out of a book. I am not saying what you are doing, or wanting to do is bad, but in the end, I don't think you are going to be happy with it.
Usually a straight up and down tree makes a lousy bonsai candidate. Unless you go with the semi of fully formal uprights styles the other styles usually prove to be illusive until the tree is beaten up and neglected for years to gain some character that piques you imagination.