Now some bass below 70Hz is visible (and it wasn’t there before), so it doesn't look like you just raised the overall volume.
It looks as if you only now turned the subwoofer on, or perhaps increased subwoofer volume, or that you used a different mobile phone to measure.
To be able to estimate optimal RC parameters I'd need to understand how your low frequiency response looks like, so I can't help much when the measurements are this unreliable.
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