my aeroflo2 set up!!!!!!!!!!

ok i purchased this aeroflo2 60 site system today just have a few questions...
heres what ill be using.
(1) 1000 watt hps
(1)600 watt hps
advance nutrients (jungle juice trio)
snow storm
purple max
gravity
molasses
OK FIRST QUESTION
(1)how tall can you veg before flowering?
(2)..IS 1600 watts enough for my 60 plants? i mean i know its 9 plants per 1k but i seen dudes use 1200 on 30 sites.
(3) is there a chance the roots can clog the sprayers?
LAST.
has anyone had good results using this system?
any help would be great help a noob

i will be growing
black diesel
purple diesel
sams grape
sorry for not stating that

It's a solid system ran one for a couple of years, I flowered out when they were typically about 12". But depends on the strain as some stretch more than others. Setting up a screen over the system will help support the stalks during bud development or you can just tie them all up. No chance of sprayers getting clogged from roots bit can't say the same for molasses, I've always stayed far away from that as it will gunk your pumps and laser jet holes up. Make sure your strains have similar timings otherwise you're going to run into issues flushing when things are ready at different times. When I ran mine I had the 60 sites split up into the larger configuration with 2400w over the sites. Having it in the smaller config will make light penetration even harder so make sure to do plenty of lollipopping.