I don't think you got everything cleared out otherwise it would not be trying to run script 2.2.1.5 and it would not say database initial schema already exists when it probes the system.
Are you sure you uploaded all the files for the new version?
Rows will be added after the schema is upgraded.
Try deleting everything again, if you get the same result again then delete everything once more and try running the script manually from query analyzer or whatever db tool your host provides. The script is located at webroot/Setup/applications/mojoportal-core/SchemaInstallScripts/2.2.3.4.config
Hope it helps,
Joe