I'm using the Yes To Carrots leave-in and really like it. My hair was horribly dry, and as soon as I put this in, it was just heaven. I could hear the angels sing. Anyhow, I'm not sure if it would be too moisturizing because you did say your hair gets over-conditioned easily. I use it every second day, and so far I don't think my hair is too moisturized. On the plus side, it has protein! At first I put in a small amount because this product really did make my hair soft and awesome, but now that I don't think it over-conditions it, I put in about double than I did before.
And we seem to have similar properties.
I have to admit though that I sometimes think this leave-in may be weighing down my hair... I might try a naked hair test and report back.