All atk rune damage by magic level

[Majeski20]

Hiho

I'm using a 8.1 ot and got the problem:
When a player advance in level they do more damage when they shooting sds, so a player in lvl 50 hits 240 , and a player in lvl 300 with the same magic level as lvl 50 hits 1100?

Please somone help me to make them shooting by the magic level size.

Thanks.