I'll be glad to help:
1. Have you selected the "Canon Pixma MG5320 Printer" template in the "Change Label Template" dialog of AudioLabel?
2. The "Canon Pixma MG5320 Printer" template should have the dimensions: Left - 6.4mm, Top - 90.9mm. Is this correct?
3. Are there any settings in your print driver that might be scaling the final output?