Personal statement help

Hi guys, I am in year 13 at the moment. I want to apply to Oxford for economics and management OR PPE and 4 other universities (probably warwick, bristol, st. andrews and nottingham) for pure economics. I think my personal statement works well with economics and political economics, but not as well with management or philosophy. Lets say if I write a personal statement with little mention of mangement (for econ&mgmt) or philosophy (for PPE) then will that hinder my personal statement?

Lets say if it does and I write a little more on management or philosophy, will that hinder my statement for my other 4 unis?

Thank you VERY MUCH!