PARANO¡A here. .-.
Even with a full party for max Kihop bonus (it caps out at 10 party members/+100% atk, I believe), TK ranker's damage leaves a lot to be desired, so +1 to the general idea. The whole idea of the top 10 ladder is to make taekwon a competitive class, but there's not going to be many people competing if the damage is horrible. With the current scores, it really doesn't take that long to get on the top 10, and it took me about 3 or 4 days to get to #1, so I don't think it needs to be reset -- but the reward isn't really worth the effort as it stands atm.
I had the idea that any future Valkyrie weapons could give normal bonuses/stats like any other valk weap, and just disable the Kihop bonus altogether while wearing it so it wouldn't be completely overpowered. I know rankers are tanky (about as much hp as a LK on pvp build, and as high as 1m hp on vit build), so maybe that could be balanced out with the weapon as well? Idk, it would need some thought and testing...