I liked your sketch; I've always imagined Sampson as larger and less intelligent than Gregory, while Gregory seemed wiry and quick-witted. In any case, Gregory's puns and wordplay go right over Sampson's head. Also, the name "Sampson" suggests someone who is powerfully built.
You wrote that Sampson and Gregory are friends of Romeo. That's incorrect. They are low-status employees of the house of Capulet and pick a fight with low-status employees of Romeo's family, the Montagues.
Since Sampson and Gregory are servants who work for Capulet, it's not accurate to think of them as members of the upper class. The fact that they are armed with swords and bucklers (a buckler was a small round shield) as opposed to the more aristocratic rapier and dagger (which Tybalt and the other high-status characters use) is an additional clue to their humble nature. Note, too, that they speak in prose rather than verse, which is another indication of their low status.
One can think of Sampson and Gregory as brawlers, men who have picked up what they know of fighting from the street, while someone like Tybalt has been taught by fencing masters, and is well versed in sophisticated styles of swordplay, as Mercutio makes clear,
He fights as you sing prick-song, keeps time, distance, and proportion; rests me his minim rest, one, two, and the third in your bosom: the very butcher of a silkbutton, a duellist, a duellist; a gentleman of the very first house, of the first and second cause:ah, the immortal passado! the punto reverso!