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After doing the export, you actually have to remove the App from the Android device so it will delete all temporary files. Then re-install and do the import and the temporary files will no longer be there. On Android devices, doing an Import keeps a backup of your previous database as well, so the size will grow. Removing iScore from the device removes these backups and other temporary files.
fyi... you can also just use the "Clear Data" option under settings for installed applications in Android, and it will have the same effect as uninstalling and re-installing. Just make sure you do the Export first, then use the Clear Data option in Android, then do an Options -> Import to retrieve your iScore data from within iScore.
After reading all of these posts concerning the space issues and extra steps to clear them up on HTC EVO, I am pleasantly reminded why I dropped Android in favor of the iPhone. For those individuals who use iScore on a phone, I recommend the upgrade to iPad. All three iScore products shine on that device, especially the baseball app.
Version 3.39 was just posted to the Android Market, and adds the ability to transfer iScore to an SD Card.