Usually I don’t recommend entering custom weights like this. I recommend using our simulator to generate custom weights for your character, here is a tutorial: Stat weights - How to generate a custom gearing strategy
But if you want to enter in custom weights, you’ll have to use trial and error until the results look good to you. The actual numbers don’t really matter at that point, because you’re not trying to predict DPS, you’re just trying to force it to do something specific. So try starting with some simple numbers like 10, 9, 8, 7, 6, 5. Then adjust from there.