Confused by mana per wisdom

[bluejam]

trying to figure out the formula to calculate my mana pool.

base pool at 60: 1516 @ 115 WIS

+GEBS
1620 ~ 124 = 11,55.. mana per wis

+vermi bp
1764 ~ 137 = 11.0769..

+enlightment
2002 ~ 158 = 11.3

+ruby veil
2079 ~ 165 = 11

+jasper ring
2146 ~ 171 = 11.16

+jasper ring
2214 ~ 177 = 11.3

+jasper ear
2250 ~ 180 = 12

+jasper ear
2281 ~ 183 = 10.3

I just don't get it... ofc 1 ring + 1 ear = 9 wis = same mana gained as if I just put on gebs. after reaching 200 wis it's more or less half the mana amount gained per added WIS, but still this really weird behaviour.

2980 Mana ~ 200 WIS (with other gear, irrelevant)
+6 ~ +31 = 5,16..
+6 ~ +36 = 6
+3 ~ +23 = 7,6..
+3 ~ +9 = 3
+13 ~ +81 = 6,23..




(WIS_UP_TO_200*11,54)+((11250+(33*WIS_ABOVE_200))/425)) with this formula I hit my current max. mana in regular gear with just a difference of 0,5 mana, but of course it doesn't work anymore once I change stuff. halp!