That worked a treat! Thanks loads for the help Toon. I'm such a numpty. I thought the corner radius would automatically increase as i scaled up the rounded square, but alas this was not the case!
If anyone else has this problem the way i sorted it was by drawing a number of normal squares and made them bigger by 5px each time and made sure all their center points lined up. I then used the Rounded Corner Effect (Effect>Stylize>Rounded Corners) to individually give each square it's own unique radius.
Fixed solution attached
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