So Dinafem seeds always recommend adding 1/3 coco to all soil grows with autoflowers, helps aerate and can also retain moisture. With your ph id aim around 6.2(calcium is best absorbed at 6.2)and you won't want to go higher than 6.5
For the nutrients, you'll need more because of the coco but less because of the auto flower. You'd probably be safe doing 1 tsp of the few your choosing once a week, or your "grow/micro/bloom" a tablespoon every two weeks...but in mid veg you'll want to back off a bit because it's all breaking down over time.👍