Hi Kerry,
just browsing through IGI Haddens and found:
John Hadden 1762 Rye - parents Nicholas Watson and Mary - this one is 2 yrs before the one listed as John Watson both church records

James Haddon 1796 - parents John Haddon and Mary Watson (wonder if this is John Haddon Watson really)
two marriages for Nicholas Watson -1748 Mercy Triggey and 1755 Mary Appleton
1790 John Watson marries Margaret Hemmings (Hadden children from this marriage)
1791 John Hadden Watson marries Mary Brown
1797 John Hadden Watson marries to Elizabeth Luxford (as you have said)
1745 Mary Hadden marries Thomas Appleton
1755 Mary Appleton marries Nicholas Watson - wonder if these two ladies are the same person
None of this finds Phoebe as we have said but perhaps the Hadden Watsons began with Mary Hadden/Appleton/Watson. I just enjoyed the last half hour or so tracking these down - even though it is to no avail!
best wishes
heywood