By number of seats of same quality I referred to all factors that are deciding about passengerīs preference.Seat quality is only one of them, but only for a small part. It will give you a higher load factor, because you offer fewer seats overall, but that alone wonīt make your flights more profitable, especially if you count all the costs it takes to change aircraft seating. He has a higher CI, that would still win against better seat quality, especially if route is not LH. Generally you should not use LH aircraft on SH routes, they loose against appropiate material in every case.They need more staff, longer turn-arounds and more fuel.
Donīt schedule frequency under on hour gaps, unless itīs a very big route with many thousands of PAX daily, you steal PAX from your own neighbouring flights.
Donīt try to win back that route under all circumstances, try to fly it economically for you regardless of market share and concentrate on other routes. Using large aircrafts on SH routes will invite others to go for it sooner or later, so donīt do that again.