Adding honey to the wort doesn't always impart a clear honey flavor either. Because honey is a sugar, it is mostly fermented out during primary fermentation. If you're trying to get a honey flavor that is strong enough to stand up to the flavors of a porter, I may over kill it a little.
Honey malt is a good substitute for real honey to get a lingering honey flavor;you can mix it in with the other grains you are using, or steep it afterwards of this is all-grain. The best results that I've had with real honey have come when I add it late to the boil. Also, during bottling, I throw a squirt or two into each bottle along side the priming sugar.
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