TDS reading low

Starting week 8 Jack Herer Auto. Both plants in FFOF. TDS 350 in one & 410 in the other. Using FFOF… Tiger Bloom, Big Bloom & Grow Big. Which should I use to raise TDS or am I to far into the grow ?

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My Jack Herer auto ran over 130 days.
If I want to increase ppm I reduce the amount of water by 50% but use nutrients as if it is 100%
So, rather than 1 gallon I use 1/2 gallon but still use 3tsp Big Bloom, 2tsp Grow Big, 2tp Tiger bloom.
You will have gauge where you during flower. Calendar weeks often has no relationship with plant age. Especially with autos.