The records you've found in IGI come from different sources- the marriage is extracted (taken from church record) and the other listings seem to be submitted (one gives her date of death as 1842).
yeah and I found a susannah tustin death record for 1843. eek, what a web I have unleasehed.
I found 5 susannah tustins death records on free BMD... the only one that might fit is in 1943
He died in 1831, having fathered 9 children - he was tired I think!!!