This kind of sums up the way a comp helps - listen to the before and after. After doesn't sound squished at all, but it stops those low notes from distorting and overpowering
Should start at 1:53, the other samples are a bit poor. Interestingly when he uses the MXR the attack is set too low so you still get those distorted peaks... but the guy at 2:49 has sorted that and cranked the attack which is how I use the M87 too except I squish much less of the signal overall.