Well I got that one "fixed", though I'm honestly not sure why. I re-imported the model into iClone and before animating it did a re-set to zero and a re-set scale after I scaled it to the right size. That scale reset seems to have done the trick thogh I have absolutely no idea why this was an issue with that particular prop and none of the others.
The lesson learned here is to import everything through Live Link prior to doing any animation in iClone, to make sure it goes over right.
That said I'm still stuck with this one:
https://forum.reallusion.com/460187/UE-Data-Validation-FAILED-on-Live-Link-transferAny help would be greatly appreciated!!!
Thank you!