when is it appropriate to score a round 10-10???

[Spicoli]

Never, ever score a round even. Even if you have to want to give an even round think of a reason why you should not such as who is the champion, who is the aggressor, who punches have better quality, who has the better shorts! Anything but a level round!

Pretty much agree here.I have always tried to break a round down by the minute to minute.Hard to come up even there ,although you can not loose sight of the whole of the round.Just a bit indecisive with a ten-ten but there are some rounds where you just throw your hands up they seem that close.