ROM Toolbox Pro Memory Manager

Hi. I'm using jellybam 4.1.0 and I have to say I have problems with performance control app, so I switched to ROM toolbox pro. Trying to optimize the phone, in memory manager section, there is a part called memory minfree. I think it set the minimum memory should stay free. There are many presets. If I am correct, the highest preset (with highest values) should give the most free memory as possible. But is it safe choosing that preset or it is too extreme?

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