Thanks again for the advice.

Tested it for a 50km ride. The shifter is set too low, felt pain on the area between my index finger and thumb, so I rotated the handlebar upward slightly, about 5mm. Will try it out again later.

As for the width, I can feel less aero as I kind of expand my chest now but when I stand to pedal, the bike felt very comfortable when I pull from the hoods, left and right.

For cornering or steering, it feels more responsive now, kinda twitchy. This being the shorter stem and wider bar.

The stem length is kinda okay for now. Feel very, very comfortable when I am on the flat bar.

Is there anything else I should look into for this setup? And yes, I think I would like to try a 42cm CtoC bar now, kinda expensive to change so soon.