1st Time Grower - Plant#1 Mystery Strain

Hey Growers, end of week 11 from seed Ran into an issue this week, my ph meter broke and I had to purchase a different model at a local hydroponics store because It was feeding time. If I wanted the same ph meter I would have to order it online, I couldn't afford to have the plant wait another day or 2 For feeding. This new ph meter gave me different readings as to the old one. I have a record of the amount of nutrients I feed it everytime, for example with the old ph meter after adding nutrients to the water, ph meter would read 4.5 - 5.0, ill add 7-10 drops of ph up and it would rise to 6.1 - 6.3. With the new ph meter after adding nutrients to the water, ph reads 4.0 and i have to add 15 - 25 drops of ph up so the Ph goes up to 6.1, I calibrated the new one and ran different tests with different liquids and it seems to be pretty accurate, The old one cost me $14 compared to the new one which cost me $60. Will continue to use the new meter and hope the plant adapts to the new ph Levels, so far I see less orange on the leaf tips Colas are getting thicker, its been a slow flowering process for this plant, looks like its growing dense buds. Smell is a bit stronger, it used to smell weird but its now slowly smelling better 🍋 ⛽️ No amber in trichomes yet. Increase in orange hairs on the buds Increase in red stems, will decrease light intensity for 5-6 hours QUESTIONS when should I begin flushing?