Your current placement setup is not idea for off axis shots.
The key to off axis protection is having your sensors as far apart width wise as possible.
For example:

Your heads are currently to central.
The farther apart you go (without putting them in that lower grille!) the better protection you will get but you don't want to open up the center to much. If you want really good off axis coverage you may need to switch to a trihead or quad in the front as a few of us have done.
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