About half an ounce of Centennial for a one gallon batch, in the boil. Then a 0.8 ounce dry hop charge. I punched the five gallon recipe into Beersmith and then scaled it and those are the figures it gave me.
It was 5 grams/0.17 ounces of Centennial at 45 minutes. Then 10 grams/0.3 ounces at 30 minutes.
Then 25 grams/0.8 ounces of dry hop.
1) That's not going to be super hoppy, but the dry hop should give it some aroma. How did it taste and smell post boil, at dry hop, and at bottling? Could you pinpoint where it lost the flavor? If you couldn't taste hops after the boil (even though it would be masked by some sweetness of the wort) you may like your beer much more hoppy.
2) How are you bottling from the spigot? Can you walk us through that?
3) How much headspace are you leaving in the bottles? There is another thread around here where bottling with very little headspace seemed to help with oxidation.