Using different tension for mains and crosses?

[Francis27]

Hi i dont know much about stringing and this will be my first time stringing a racket. Am i allowed to use a different tension using the same string for the mains and the cross to make a wider sweetspot (because i dont feel like buying 2 strings its too expensive)? Like lets say im going to be using luxilon alu power rough as a full string bed can i use it on the mains @ 57lb and then 55lb on the crosses? Its kinda like stringing hybrid but with one string am i allowed to do that? the main purpose im asking this is because i just want to largen the sweet spot by having a higher tension on the mains and a slightly lower one on the crosses