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Yes and yes! Unless you know that your music will be played on equipment that can reproduce those subsonic vibrations, you should remove them. Otherwise, they are just eating up space in your mix. It can also help to remove audible low frequencies. It seems counterintuitive, but a kick drum often sounds better if you cut out some of the lower frequencies. ...

I'm not 100% sure I understand your question, but here's what I think you need to do: Add some compression. This will bring down the peaks closer to the average level. It will only affect the peaks, not the rest of the audio. Normalize. This will raise the level of the the whole audio clip to the specified level. The end result will be less variation ...

It's definitely bad if ultra-low frequencies take away a significant amount of the power from the rest of the mix. However, that only happens if they are in fact as loud, or louder. If these frequencies fit in principle well in your material (i.e. not just rumble, but nice rythmic sub-punch) you should not kill them completely, rather just push them well ...