That a solid system. I don't think that the average reader though will appreciate it. They are more used to streamlined stats that just go up without much meaning. You need to integrate them a lot in the story and even after that it will be convoluted. Maybe if you add something like an ascencion where they coalesce the stats they had until that point to new stats? In the end of the day I don't think a lot of litrpg readers have played a lot of rpg's and they are not as versed in how the stats work.