Heat load and gain has a lot to do with the location you are at. IMO, it sounds like the 14,000 btu. gain is way low. There again, I don't know your location. Here in central Indiana, your home would most likely call for a 2.5 ton- 2 ton. It is a rule of thumb to upsize a heat pump a half a ton so you get more heat in the winter time. Here is a thought, get a 2 speed 3 ton hp, it will run at 2 tons mostly but if you ever need more power, than it boosts itself to 3 ton.
Good luck
As iron sharpens iron so one man sharpens another Proverbs 27:17 NIV84