Jed, I've noticed you hitting it hard and heavy as well. There are bigger Zelkova's around. A revered tree, both for appearance and the wood it brings. Once planted in abundance, like no garden was complete without one. Years ago we were whacking them fairly frequently for justifiable reasons, but they only come up now and again now. Unfortunately when the large spreading branches get cut back as they often were, they usually get serious rot coming down. Many suffer that fate. It's a type of Elm if people aren't familiar. Not a fun wood to split for the stove.
Cory, I've only worked with this one sherpa, but if he is indicative of how they all work, quite a force. Sponsoring one to bring him over for a crew could be a real asset, if it were possible.