I see some new sugar leafs turning yellow in the e...

if referring to picture 14 / 16 at the top of the plant, i'd wager it's light stress. but, those are fan leaves. check ph, if proper that rules it out. could be a bit of bun, but if slow moving or any tweaks lately i'd let it play out to be certain what it is before reacting. By 10 weeks in, you are probably providing near 100% of the plant needs and 750TDS is not extraordinarily high.. it's a generally safe range at which you could potentially feed every irrigation. I can't see any of the sugar leaves in the pictures. I do see some damaged fan leaves.. mostly at the top and some at a node or two down from the top. Still think that's just light damage. 40-45DLI is a good chance of being too high for ambient CO2 levels. 45DLI definitely is.. 40 is borderline. Not all spaces have same co2 levels and your VPD is just as important to maximizing elevated CO2 use too.