Advice for lacetti 1.6 remap for higher torque

Points
1
Location
Romania
Car
Lacetti
Hi,
I saw this article https://www.torquecars.com/chevrolet/reno-optra-lacetti-tuning.php and I was wondering if I can receive some infos about remapping a lacetti 1.6 2009. I want 2 things:
-to make the pedal - engine torque directly proportional (gradual increase to avoid dead travel of the pedal)
-to increase the engine torque over ~ 3600 rpm up to 6500 rpm when the pedal is pressed over 70-80 % by lowerig the AFR under 14 (and not touching the spark advance).

Reasons: I use the car daily and also for amator rally. The car's weight of ~1250 kg is a bit high for the engine's factory torque figures:

For example, can I do this with ECM? From what I saw on youtube, it provides rpm/load
maps with no info about measure units for load (grams/rev or MPA, I don't know) nor for the table values.

Thank you.
PS I know the Nm increase can't be more than 165 Nm vs the original 150 Nm.
 
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