I guess your Instagram experience is pretty weak as well. If you are willing to post only to show visibility to your Signature, please avoid recommending incorrect things.
300 is not high at all. I usually use Instagress to unfollow with fast settings without any problems, 480 a day is okay with Instagress, but depending on the age of your account you might want to start with slow-medium settings.
Consider that I unfollow up to 800-900 manually with my phone on my manual accounts, there shouldn't be any trouble doing half of that with a bot if everything is set right.
Best Regards,
Jaymien.