adjust your irrigation habits.. .water entire thing until there's some minimum runoff (for soil). wait for top 1" to dry, then repeat. Feeling the weight of the pot at this point will be the best signal to water, going forward.
it'll use the same volume each time -- the missing weight. you can't know how much this is until you do it. after that you can more accurately mix up fertilizer to avoid waste or irrigation water stagnating as it sits around. Whether you fertilize or not, this is the procedure to stick to.
if you use the same pot size and same substrate composition each time, it's going to be a similar volume each time, too., you can get familiar with it, but only in hindsight.
i'd suggest more perlite with soil. closer to 50/50 including what comes with the potting mix. this will make droopy leaves caused by irrigation vitually impossible. This may not be the cause this time, but will also promot healthier root zone and happier plant wiht greater growing potential, relative to its genetics.
if you think the rootball get disturbed or what you transplanted fell apart a bit, it could just be recovering.
i think a week of normal irrigation habits will probably fix the problem.
if leaves get extra dark or start "clawing" more, reduce concentration of fertilization. google image search "marijuana leaf symptom chart" or similar... you don't have any issues now, but when you do using the chart will teach you about it as you encounter things. anytime it seems confusing, it's more likely nute-lockout or ph-related. simple symptoms are easy to adjust to. you look it up on chart, and reduce that component as best you can without impacting other stuff too much.
i think this look to the leaves is related to watering habits, though.