You should not transfer more money than required. If you need to block a higher amount than what is showing as the total required blocked amount on your Expatrio portal, then you should update the set up of your blocked account first before transferring excess funds.
The Total Blocked Amount already includes a €100 buffer, all fees for your blocked account and the Additional Basic Sum (if required by the Germany authorities).
If you are requested to deposit more than the standard monthly amount by a visa authority, we require official confirmation from them confirming the same. This can be an email or a document too.