I'd hold off... you have nutrients in soil to start + seed is packed with power for a couple weeeks.
i'd be a bit more gentle with the last to pictured plants. they show a little something happening.
you should notice growth all of a sudden slow down. if it isn't ramping up, it is slowing down for sure. You see that, you can give a low dose of nutes.. observe and go from there carefully.
Don't get OCD about it.. remember 90% is your light and the rest is just us not screwing it up along the way...