JCA, my LSU P's leaves do not curl like that, but if the tree is growing quickly, that sounds good. Don't stand too close to it, or it will knock you over growing. :) Where do you live? That's a gorgeous satsuma tree! I will be having one put in soon--An Owari.
Will, have you checked the roots for RKNs? Even if the LSU P is supposed to be resistant to them doesn't mean it can't have them because resistant doesn't me immune. If it's not growing strongly, that bothers me. If it's still in the pot you got it in, you must not have checked the roots. I think that the LSU P needs legroom, the way it grows. You should see the big tree James Robin has--It's all over the place. Mine tries to grow all over the place as well and they tend to be rangy trees with not a heavy leaf cover. When I got my tree from a local nursery, it was in a little pot and I put it into a larger pot that should have been too large for it, but it fixed that and burst into growth and filled that larger pot with all kinds of roots. It's a lusty variety. Did it get any girth growth? When I first got my LSU P, it got transplanted three times in a row and sat for a short while, then when I put it into the larger pot with the Fafard Potting mix, it began to get a thicker trunk, then finally started tip growth and hasn't stopped since.
Your poor little tree. I hope it will start to do better for you. Please let us know what condition the roots are in when you pot it up.