Wisdom to Mana conversion ratio?

[DeathsSilkyMist]

Here is a bit of background information first:
1. There is a soft cap on mana gains from INT/WIS. What that means is once you go over the soft cap, the amount of mana you get per point of INT/WIS is reduced.
2. The soft cap for all classes when it comes to gaining mana via INT/WIS is 200. When you have 201+ WIS/INT, you are getting reduced gains.
3. Once you hit 255 WIS/INT, you stop gaining mana from WIS/INT, even if you would go over 255 in terms of total stat points.

For the first test I conducted, I am using my level 60 Shaman:
1. At 199 WIS, my total Mana is 2891. When I reduce my WIS by 60, my total Mana becomes 2056. This is after taking into account the extra 160 direct Mana points I am getting from my items. This means the calculation is (2891-2056-160)/60 = 11.25 Mana per point into WIS under 200.
2. At 222 WIS, my total Mana is 3181. When I reduce my WIS by 20, my total Mana becomes 2999. This is after taking into account the extra 70 direct Mana points I am getting from my items. This means the calculation is (3181-2999-70)/20 = 5.6 Mana per point into WIS over 200.
3. Since 5.6 is basically half of 11.25, my guess is the real ratio is exactly half (5.625), but they round down to 0 if under 0.5, and round down to 0.5 if over 0.5.

For the second test, I am using my level 24 Cleric:
1. At 134 WIS, my total Mana is 748. When I reduce my WIS by 20, my total Mana becomes 643. This is after taking into account the extra 15 direct Mana points I am getting from my items. This means the calculation is (748-643-15)/20 = 4.5 Mana per point into WIS under 200.
2. I do not have the ability to get my Cleric over 200 WIS at this point, but I do not believe it is necessary for this test.
3. 24/60 = 0.4. When you multiply 11.25 by 0.4, you get 4.5, which is the same value we got above. This means Mana scales linearly from 1-60.
4. This also means Clerics and Shamans have the same ratio of mana gains.

So for Clerics and Shamans at least, the formula appears to be:
1. 0.1875 * WIS * LEVEL = Mana gained while under 200 WIS
2. (0.1875 * WIS * LEVEL)/2 = Mana gained while over 200 WIS