Easier to change the plant, buy redder varieties of that same species etc, selection, vs trying to tweak everything. The same tweaks often do not work for other folks.
Lots of variables, good CO2 has always seemed like a factor, but that's a factor for a nice tank where CO2 is used............even well run non CO2 tanks do well with red color species.
Still, stick with CO2, moderate light. Unless you like more work, less fudge factor and less wiggle room in your routine.
That's about all you gain from more light.