I am really convinced the installation was well performed, every step of it. Again, thanks for the instructions and countless tips.
As I wanted to change the throttle cables, I went ahead and pulled out the carbs to check.
Everything was perfectly clean, but the strange thing was the floats height being completely out of spec, 10 to 11 mm.
I set them back at 14.5 mm.
I have the original throttle tube 36 mm, which I now trimmed to 34 mm.
Was a good move, and at the same time I get a slightly lighter actuation force.
After readjusting the floats, the engine is now easier to start, whether from cold or hot.
Perhaps is running smoother too, and with the trimmed throttle tube, I think the throttle response is less harsh now. I still need to check it better in a longer ride, but so far seems promising.