cheers for the comments
your silica administration sounds about right but i probably wouldnt go highr than 8ml, the ph is quite high so you need to monitor that more often but this will result in a stronger frame to hold more weight, id only use silica from seedling to full bloom switch over and by then she should be ready to go into full flower production and i also read that its best absorb below 5.8 which is perfect veg
as for grow time im not 100% sure as ive got 2 phenos and im guessing the quickest will be done around 70-80 days, we will see in the remaining weeks how quickly or slowly they develope
i extended their veg feed aswell to increase size so this may also be taken into the consideration