24/15 is not a balanced build
You probably never played 1h no shield, because it is on 1h without shield. I am a balanced build whore all the way, picking 18/21 on 30 and 21/21 on the higher levels for all my melee builds. But when I play 1h no shield, my builds of choice are 21/18 and 24/18. Fact of the matter is that 1h weapons have low damage values, but their low length, low weight, and low penalty that 1h weapon group receives combined means that you move relatively fast. Mechanics are built for using a 4-7 weight shield with it.
24/15 on 1h no shield feels like 21/18 pure pole/2h. 24/18 is the 21/21.