I think I finally discovered which J seats have the most room! the original report mentioned inside and outside having different pitch and bed length but neglected to define inside/outside. I've trawled thro all the TRs and photos etc and it was actually made clear in a link from post#39 in this thread,
seats B,D,Gand J have 70" whereas A,E,F and K have 79"
Unless someone knows different?