Wow... I missed the last few posts for some reason.
Here is an update with it all leafed out.
The new branch is coming along fine.
Stan, when I repotted this in May, I wouldnt have wanted to go with a smaller pot because I would not want to cut back the root mass any more than I did. If I go with a smaller pot, Id imagine that I would also have to reduce the top quite a bit. I really dont want to do that.
I am also afraid a smaller pot would also require more frequent watering. Right now it gets watered almost every day, sometimes every other day. Since I work for a living, putting it in a pot that would require more than one watering a day would be difficult.
Thanks for the update, it's certainly looking good.
On my previous comment about the smaller pot: I think you'd be surprised how tolerant elms are of dryish soil, especially if you don't spoil them in the spring by overwatering (and creating lots of fat, white roots). Elms can absorb water through their leaves better than most other plants, so you can get away with alternating misting and watering every other day in the spring, just be sure to use an anti-fungal (not copper). Then in summer, be sure to moss the soil, and you'll be fine, having to water once daily. In fact, look at how much smaller last years leaves are than this years. The difference could be several things (watering, fertilizer, root run, sun), but most of them would be affected by a smaller pot. On reducing the root ball, you're right in that it should be done slowly, especially if you have that typical one large root system. But I would still love to see this tree in a slightly smaller and much daintier pot.