I would probably stand it up to print, but you say that makes it oval? You can use this test file to calibrate X and Y, and then if it still stretches you use scale to control the Z (height). For example, if it is 1% too tall, you can scale the model down 1% then stretch X and Y both by 1% in the fine tuning tool to cancel the effects on those axis. If height is wrong by more than say .5mm I would contact support if it were me.