Incomprehensible scanning of frost ash

I use a regular dual blade, it scales from strength C, dexterity D.
After frosty ash, it scales from strength and wisdom D, and dexterity C
But in fact, dexterity alone is not enough to achieve good damage, I add wisdom, but it gives 2 -3 points only up to 20 values ​​..
And with strength it’s not clear at all, it gives 2-3 points, then 1, and then again 2-3. What is the best way to sway characteristics to frosty ashes?