does it kick back during cranking?
Every combo is different, but 30 seems to be a lil much at a normal 750 idle.
But you can't always give her what she wants at idle, because it will be too much everywhere else. Actually I would say that you can rarely give a street engine the idle timing it might like. And there is nothing wrong with that, especially if she's an automatic with a hi-stall. Just be sure the power timing does not exceed the ability of chosen fuel to withstand detonation. Which usually falls around 36*@3600 depending .....