Karlos i know what you mean, cars with a lower cr tend to feel flat off boost, whereas stock or raised cr feel alot more responsive...
Also what Jed says is a valid point, combustion chamber design must make a diff to the safety of an engine not just cr.
Modern advancements in ecu programming aswell help us to run higher cr's safely... Whereas manufacturers engineer in a huge safety buffer for lower octane fuels, high intake temps etc etc...