Patience and small steps.
If you want to add nutes, start small (half what is recommended) and see how the plants respond.
If you want to add more light%, it doesn't matter what I did last grow, or what you did last grow for that matter. Turn it up just a bit, the let it go for a day. If they have issues (yellowing, wilting, curling, whatever) turn it back down and wait. If they like it, add more. But it is better to go 50-55-60-65 etc. daily, than to go from 50%-75% all at once.
Getting in a hurry will almost always have bad results. If your plant has normal issues they will crop up slowly. When we try to kill them by doing too much it happens rapidly!