My FSA Pig Unsealed with 24Seven ceramic bearings spin about 8 rounds or so on average , the nut is tight so there is not much movement in the bars and it is stronger.
Well , back to business... Try breaking it in the headset first. Give it maybe a few weeks or a month. If the problem is still there or in 1 week and you feel that the problem will always be there , dismantle the headset and again , hammer in the cups but don't hammer the cups using a hammer directly on the cups.
Sometimes , headsets don't spin well because the top and bottom cups are not paralleled.