Okay, I may have spoken too soon.
The L2 MTU for everything was 0, which I assumed was a problem (and may be). When I set the MTU of the interface higher, it went higher. VMWare is set to 9000. With VMXNet 3, when I set it to 9001 in CHR, it errors, but 9000 works. Intel E1000 accepts 9001
Seems good for now, pending actual testing.