need help with scrog

hey everyone, just wondering what people think of my scrog. 4 purple kush from seed vegged 24/0 under 400w mh for im thinking about 8 weeks. now under a 600w hps dimmed to 75% for now, still at 24/0. 4 x 4 mylar lined tent with loads of ventilation and good temps.
this is my first scrogg, so im just wondering when i should flip the cycle? ive read to wait untill 70ish% of the screen is full, but with 1" holes ill need like 1500 tops to fill 3/4 of the screen lol should i flip them now and keep pulling them back until the stretch is done? or do i want to get all the tops to the hole they should be in and then flip it and let them grow up through the stretch?

Keep tucking until after 3 weeks of flower, then let them grow up.

Don't worry about filling every 1 inch hole, doing this is not giving the buds enough room to grow, circulation will be reduced big time leading to a lot of leaves transpiring on each other and next thing mold.
I personally use 3inch spacing and find that is just about enough for each budsite to get enough air and light.
Get a little oscillating fan for under the canopy, will be needed when net is full.

Hey 2EyedCyclops in general most SCROG tutorials tell you to flip at 75% which works just fine. I have been running SCROGS for a while and I switch at 80-85% but just because I like a really thick SCROG. Once you flip to flower you can expect another 1-2 weeks of Vegetative looking growth give or take. MickFoster is right you will keep tucking until the 3rd week of Flower giver or take. As far as the holes zypheruk is right the main point is just to have a level even spread that gives every cola the individual attention they so eagerly desire not so much filling up every square. I use 3' spacing the same as zypheruk and find it works just fine. I would also listen to his advice about the oscillating fan underneath the canopy for airflow ( something I have as well ). Everything looks good brother keep up the good work and keep us updated.

I'd let those ladies bush out another week or two then flip, they'll double in height so take that into account. I use 3 nets with my plants to help spread em out and keep colas away from the center cause light bleached buds are ugly.

Edit: and limited height is even worse