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When you disconnect the O2 sensor it will never kick in vtec because you get a check engine light and you have now made the ecu run the motor blind.
This puts it in limp mode which will, for safety reason, now run the engine at a safe AFR.
It will be somewhere around 12:1 AFR which will feel like slightly more power because it is running rich(safe).
Your method of testing is too random and since you don't understand it well, you are making bad assumptions.
Start learning about open loop and closed loop and you will see that your assumptions of different mapping is not as easy as you posted. Although somewhat true it utilizes 3 different maps for those 3 different modes, while in closed loop it uses the maps as a starting point and relies on the O2 sensor for fine tuning to maintain the proper AFR. Without the O2 sensor it will have to fall back into a safe zone and protect the engine from a catastrophic outcome.
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