The corallites look a bit small to be a tenuis IMO, that's why I was guessing a stag (But it could definitely be Acropora tenuis as well). Although most large stags have long branches without many forks, that is pretty dependent on flow. I have a stag in high flow that is branching like crazy, while some of the ones in lower flow have long branches that don't seem to split much. Did you look into the Acro sarmentosa as a possible ID on the second one?