When page layout looks messy with the default heading size then you can use CSS adjust it so that it fits better together with rest belonging to the look and feel of the site.
And of course, whatever we have discussed here is for one keyword phrase. http://UEF-Clan.Mkmmngt.com/__media__/js/netsoltrademark.php?d=youron.com%2F__media__%2Fjs%2Fnetsoltrademark.php%3Fd%3Dlaunchhappy.co%252Fguides%252Fchange-website-tab-name