Start a diary...........without knowing exactly what you may or may not be doing and then giving meaningful answers based on a few random pictures is never going to be 100% accurate or be the best help.
Going by the pictures though, the curling could be from either too much heat, too much light or not enough air circulation.........or a combination of any of those three.
A couple of tiny holes is no big deal, no plant will ever have 100% perfect leaves.
But without knowing a lot more specifics.............
Plants also look very green, bordering on being over fed....if you are feeding them............or the soil is quite "hot".
Are you growing at 24/0??
If so, stop.........18/6 is optimal...........all cannabis plants NEED "sleep"!
What is your watering routine like?
Are you fully wetting the pots or only dribbling small amounts of water next to the plant?
The way you water will affect your plants too.
Remember, the answers you seek can only be as good as the imformation that you provide.
Start a diary and fill it out with evertything you do.