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@BringMeMyFix
90/100psi isn't particularly low (especially on clinchers). If anything, running high pressures cause the bike to feel more skittish on fast descents - less compliance, so road irregularities cause 'mini-air' moments. There's usually a happy medium with tyre pressure, based on the characteristics of a ride e.g. bad road surfaces, wet road surfaces, rider weight/speed, loaded/unloaded bike.
I know tubs are usually run at higher pressures, but you can also get away with lower ones (compared to clinchers) without the tyre deforming weirdly.
If you're 'floating', I'd say that's a good thing; if you're 'bouncing' in a very squishy fashion - i.e. not just due to poor pedalling form - that's the time to increase pressure a little.