It's really going to come down to the beer, for example, your porter may have just been a little too comes in other ingredients that over powered the spices or whatever. Some elements also fade quite a bit when stored for a long time.
IME, lighter beers benefit from late additions and darker beers benefit with the secondary and longer times conditioning.
Nothing Left to do but smile and drink beer.....
The Commune Brewing Company-Perfecting the "art" of beer since 2010