I used to go to 50psi but experienced savage wheel bounce one day when i braked just before a small step on the road surface. All was well until the tire went over the step, which was about 3/4" to 1". Then my front wheels just bounced like crazy and the ABS was going at it like a minigun! I sharted as i continued to "slide" onwards. Dropped to 40psi and it didn't happen. Maybe my shocks are on the way out but they still pass the NCT which is a biannual test on the car to ensure roadworthiness.
Having said all that, there was great grip on smooth surfaces and even wear, once i didn't go sidewall max from new.
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