The speeds on LTE are too crazy! :O
Those upload speeds (anything above ~5) are a bug.
XOOM + is even a better COMBO IMO (I have Pad #2 as well).
LTE is great for Down/Up but has too much latency at this point. My Pings are similar to yours -- way too high!
Another ISSUE with any tethering is that the tethered device throughput is degraded - In my case I'm seeing several Mbps variance.
Look forward to getting LTE on the xoom for full LTE speed.