pH 6.1 in coco is ok. 1700 ppm is way too high !
Veg cycle:
Seedlings 200-500
Young plants between 5 to 8 weeks 500-800
Old plants older than 8 weeks 800-900
Flowering cycle:
Week 1 to week 3 stick on Veg nutrients 800-1000ppm
Week 4 to week 5 switch to Bloom nutrients 1000-1100ppm
(1100 is the max before turning into an hypertonicity condition)
Week 6 to week 7 800-700ppm
Week 8, week 9 flush the Indica
Sativa over 9, 10, 12, ... weeks, flush 2 weeks before harvest.