If you have too much head and gassy beer (as suggested by the OP), then of course just reduce the priming/pressure. But, you see a lot of posts from people making highly carbonated beers that have no head. The natural "solution" is bump up the gas, but such a solution often fails.
I prefer low carbonated (hand pumped) beer (though I do make the high carbonated stuff if I think its right). I do not have problems with head on these beers. Odd that?
The head is of course made of bubbles! Each bubble is a delicate skin of beer containing gas. Brewers, especially of high carbonated continental beers, try to improve the head by making additions or managing the brewing process to make that "skin" as strong as possible. E.g. many "mash" brewers use wheat which contains stuff that will strengthen that "skin". But however strong you can make the "skin", if there is too much gas the skin stretch's too far and the bubble bursts - the head collapses or perhaps never gets chance to form.
So if loads of carbonation but no head, reduce that priming. If you end up with head but carbonation too low for your tastes: First change the way you brew or make head enhancing additions, then, and only then, bump up the priming/pressure.