Get rid of the CO2 bag ... it will offer nothing to this grow , since temp is to low for plants to utilize.
Plus it should have been hung above to release CO2 ( which is heavier than air ) to rain down on them.
High 80s temp allow the plants to open up to it. Leds are not very good at heat. And often need supplement heat introduced. Autos need as much light as you can throw at it during its short veg stage especially..... so it can grow the rootmass as quickly as possible BEFORE it sexes out around week 5 ( day 30-35 ish ) . You can also LST them to “ open “ them up for better light penetration.