Making sense of J coupling data for Hydronium
I read this as indicating 2JH-H = 9.6Hz and 1JO-H = -163.8Hz. That's a large O-H coupling.

For water, experimental values have been reported as 2JH-H = -7.3Hz and 1JO-H = -80.6Hz 1, and calculated values vary, but within an order of magnitude. Gas phase studies for 1JO-H also provide values around -80Hz. I can't explain the large discrepancy here; perhaps there is a significant change in bond angle for hydronium? Or perhaps a poorly refined calculation set?