To answer my own question, 9 years later: The Sea View in question is a sub-townland area located in Forth Commons, on the mountain of Forth. There are references to the area from before 1865 down to the present time.
This makes perfect sense to me as the correct location, as the family concerned were residing in Forth Commons at the time of Griffith's Valuation. And yes, there is a "sea view" from the mountain, hence, presumably, the name.