Cinderella, I would not do both at the same time. If you change too many variables at once, you won't know which one worked or didn't work. Catts take pretty bright light and I don't know how young your seedlings are but if they are NBS I would think you could leave them in the higher eastern light. If they are dry, then maybe upping the water to twice a week or twice every 8 to 10 days even, might be a good idea. My NBS catts are in SE light and I water 2x a week, or when dry. If you are unsure of their dampness there is always the bamboo skewer trick.
*disclaimer - I'm a newbie too, so would love to hear some other opinions.