They look to me to be a little further along than just 4 weeks of flower, that last pic looks ready to harvest (just judging without seeing trichs close-up).
No matter what happens here in the coming days, it looks like you'll have a nice harvest.

The only thing that looks peculiar to me is the runoff pH, you said it's coming out at 5.4. That would mean your medium is that low or lower to bring your water down that low. Lockout will happen just as easily at the low end as the high.

My 2 cents at 1 a.m., hope this helps some.
irydyum Reviewed by irydyum on . LEAVES DYING FROM OUTER TIPS INWARD I have 3 plants that I bought that were already in flower. All plants were in 5 gallon containers with a very sandy compacted soil...I transplanted them into 10 gallon pots using Roots Organics soil. Unforntunately I dont know anything about where the plants were or what their feeding schedule was...by the looks all 3 plants are at different stages. The UK CHEESE is the eldest...approx 4 weeks into flower. HEAD CHEESE approx 3 weeks into flower. SUPER GRAPE APE approx 1 week into flower. I Rating: 5