I've heard that one Anglican group, from Australia I think, who are very close to communion with Rome and a number of individual Episcopalians who have converted to Orthodoxy (in my own parish for example)but no groups coming over to Orthodoxy. Are there any? It seems such a good fit.
The group you mention, the TAC, is actually wider spread with churches in India, UK and North America (the ACC). They are in close discussions with Rome. And my own church, the APCK, has had discussions with the TAC.
You mention "it seems a good fit." But nobody (really) seems to think in that direction -- it's always towards Rome. Perhaps if the Orthodox started engaging in discussions with the Anglicans that could change.