Hi Tim, sorry for the late reply.
I'm not using Advanced PDF templates for this, just the Custom PDF templates for this form. I understand that I could do this with Advanced PDF/HTML templates, but I've also tried it, and the problem persists, wherein plugging {trandate} still fetches the Sales Order's {trandate} over the Item Fulfillment's.
I appreciate the concern, and given time I might give this another look, but as it stands, I've solved my issue with the solution I mentioned prior.