Looks good
Stanzcooked
peeps are watching, then just are more will to jump if they see a problem.
your going to have a full box and to answer your questions
1) you need about 4 to 6 Sq inchs per each top, don't want them touching.
2) you are good with the veg time, last grow I flipped a plant at 5 weeks, some I wait 8 weeks, small pots will keep plant a little smaller and veg time does not always determined plant size.
3) 2x or 3x is what to expect, you may need to remove 1 plant to keep 4 alive and healthy all the way to harvest, it would not be a waste of time, but trashing all 5 for rot because of overcrowded would. Just keep a good eye on you spacing and if it's getting to crowded, take the runt. For reference, the max I run is 4 plants ( strain depending) in a 3x4x6 tent with 600watt hps.
congrats on all the luck with the females and as far as tips go I would suggest to keep your PPM at or below 1300 for intake, and give your girls a good plain Ph'ed water flush in the third week of flower to reset the medium for the rest of there Journey.
Happy growing.