Hmm I never had problems lving my Genie with spirit even with chars on 150.Did you genie got stuck somewhere on 146 , 147, 148, 149?
you need to press on Infuse till the bar its fullthen press Confirmthen Level Upkeep pressing this 3 buttons it will evetually work.its a bug due to the level cap being 150.
In the stage where we are given a choice where we want to infuse by either exp or spirit or cube, only the cube option works. The remaining two can't even be selected! I have tried many times.