Try doing it(same amount) 2x a week, that should do fine at 130w.
When you want, try 3x a week with 260w and do say 75% water changes etc.
Make sure the CO2 is good and you have good surface movement/a few ripples etc, you can always add a bit more CO2, shut the CO2 off at night.
when you have less nutrient limitation, the plants will also use more CO2, as plant biomass increases , the CO2 uptake will also increase.
So keep pruning the weeds back to maintain a somewhat stable plant biomass.
The added current and surface movement will help stabilize CO2 and prevent low O2 as well, with good plant growth, there should be plenty of O2 most of the 24 hour cycle and at night since you have some decent surface movement, you will still ahve good O2 levels. Surface movement also prevents excessive CO2 build up in the tank as well, if you have none, the CO2 can buld up easier and higher ppms before you see the fish gasping and then when they do, it's pretty bad.
The off gassing from the surface movement allows you to maintain a fairly stable CO2 level, not too much, not too little and still have good O2 levels even if the plants are not growing at all.