Grizzly Purple Kush Greenhouse - BlmBurn

Hello - having witnessed some truly epic grows on this site, this is my first grow - motivated by medicinal needs, (am running three strains), this specific diary is for Barney's farm ZkittleZ OG Auto - I thought I would put it up for review in order to encourage any helpful advice that the community can offer. Greenhouse and outside combo, (essentially avoiding rain) and as it is the first attempt to understand the craft, I have tried to keep things as simply as possible. I will start separate diaries for the other two strains, Barney's farm Glue Gelao Auto and Grizzly Purple Kush Auto from BlimBurn seeds - but all three were started together and have been (subjected) put through the same feeding/watering regime. As I write this it is week 8 - the girls are at 52 days. This girl was planted in a small pot post germination (1st May), transplanted into final pot (25ltr fabric pot) on the 17th of May, which was when I started to feed her. Regular ph'd water between 6.5 & 6.8. Occasional foliar spray with ecofective bugs & mildew. I stopped spraying when there were obvious signs of flowering. Have been feeding since week 3 - first with some seaweed extract, then with some GroSure tomato food (5ml in 4.5ltrs - across the three plants) and finally with Vitax Q4 powder (7.5g to 10mg). Feeding schedule is circa every 3 days .... if it has been humid or raining I have tended to stretch to every four days. As mentioned above, comments welcome. Would be interested to know if I am vaguely on track from anyone who has grown this specific strain before... however there are a serious number of questions I would appreciate having answers to any of them (please see below)... from my 'research' the majority of the community grow in tents, but I would still be grateful for any suggestions. Is the suggested harvest date (64 - 70 days) reasonably accurate? BF's reputation is very good and I am impressed with the quality of their seeds, however I am finding it tough to gauge where I am in the life cycle of the grow and whether or not I am on time, a little behind or if it is even possible, ahead for any reason. How much can grow environment effect this timeline for this strain and autos in general? I am not talking about amount of sunlight (I cannot control that element) but whether it is reasonable to expect a delay to harvest date if environmental factors are not optimal? Does growing in a greenhouse impact this at all? If the timeline changes, what are the signs to look for - pistils changing colour, additional trichome development (I understand pre-harvest analysis of seeing mix of milky and amber) but as the buds are developing I am still unsure as to a few things. How to know when to stop feeding? How to know when to start flushing? Is two weeks the right amount of time? Is this to be repeated every day until harvest? How much h20 to flush with for 25ltr - 30 ltr fabric pots? Is it until one sees significant run off? (I have the pots sitting in saucers) How much run off is one looking for? (Is water being 'clearer' important? Is it important to stop watering at all a few days before harvest? As mentioned above, I would be grateful for any advice and/or answers to the questions above.