Simple bug report:
lv100-120 reports a QP cost of 503M
Lv1-120 reports a lower QP cost of 416M
This is with no skills involved, those stack on top as usual, but the reduced total when trying to plan a 1-120 remains a factor.
If you increase the lv between 1 and 99 as the start point, the total QP cost rises per level up, up to about 73. Then it fluctuates up and down, except for 90-100 where the cost of additional grails is taken off as you go up, so it reduces or stalls here.