New Growth Twisted.

I have 2 spider farmer 1000 lights at 18" raised to 20" when I noticed the twisted growth. Temp has been Highs of 72F(22.2C) low of 65.5F(18.6C) Humidity has been around 50%,
Using General Hydroponics nutrients.

Running RDWC - I noticed this day 74. Flower 11. EC is us/cm
Day 71F08 - EC 0897 PH 6.04. Tied down the branches .
Day 72F09 - EC 0955 PH 5.81. Added a 4L batch 2ml Gro 2ml Micro, 8ml Bloom. EC 0942 PH 5.96. L
Day 73F10 - EC 0934 PH 5.56. Added a 3L batch 2ml Gro, 2ml Micro 6ml Bloom. EC 1095 PH 6.72. Checked after 2h of circulation EC 0955 PH 5.98
Day 74F11 - EC 0934 PH 5.34 Added PH up to 6.0.
Day 75F12 - EC 1076 PH 5.38. Added a 2L batch 1ml Gro 1ml Micro 1ml Bloom.(EC 0751 PH 7.25). Checked again and levels were high again at 1028 and EC was at 6.04. new growth tips looked burnt. Added 2L tap water PH 6.0
Day 76F13 - EC 0917 PH 5.68.

I have a grow diary going but not sure if I am allowed to link it here.

Idk what ph is ideal for hydro but when i see twisting like that on a soil plant its usually because the PH is off a bit.

That would make sense. From what I have read PH for dwc is between 5.5 and 6.5. So when I noticed it the PH dropped below that.