Well you can't until you get to a high enough level to choose the upgrades, you can level the spirits via console to see if it has any effect though.
And there's no point in leaving original values intact if you're already changing the tables, Csimbi. The devs made them with the maximum value being the last upgrade in mind to make them as balanced as possible, if you change the table you need to also balance things out, which is impossible without changing the original values.
