looks like it perked up a bit after being watered less... I'd let it go a bit more like you said...
Check out my plant at 1 day before 3 weeks old to see the size compared to yours (This was at 2 weeks and 6 days)..
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And I had just given the plant it's first nutrients 2 or 3 days earlier.. at around 2.5 weeks...
I think a LOT of it depends on the strain to be honest...