Should I transform my scores?

I am using correlation scores as the dependent variable in a multiple regression e.g. I am looking at which personality factors predict how well somebody can assess their own performance (expressed as a correlation between how the person thinks they are doing and how they are actually doing). Should I transform these into say a Z score or do some other kind of transformation in order to get more spread in my data? If so, what would you recommend?

Please help, am really stuck on this!! Please ask if you need more clarification as to what I mean, if I have not expressed my question clearly.