Hopefully Creamsteak doesn't mind me borrowing his spreadsheet.
You'll find attached a spreadsheet that lets you compare Creamsteaks original formula prices, the HP/MP is 75% of the value of Def/Str before squaring, and the HP/MP is 75% of the value of Def/Str after squaring.
You can even tweak the 75% to any percentage your heart desires.
Edited because I forgot to attach it.