Upgrading your LI account from basic to premium doesn't improve the performance Orca, it just allows Orca to run more engagements per day. In order to keep your account from being flagged by Linkedin, we limit the number of engagements you can run per day.
Engagements are LinkedIn views, connects, and follow up messages.
On Basic accounts you can run up to 100 engagements a day and for a Premium account, Orca can run up to 200 engagements a day.
Note: The number of engagements per day is random.