a week before turning. ends turning/bending... jug size to feed ??

hi everybody just a couple quick questions

my plants seem like they arnt stood as up as they could be? if u get me? sometimes they droop(not like when theyve bin over fed) just like sittin but slantin downwards abit.
the ends are turning like their too hot, when i know there not room goes max 80 normaly sits at 72-75 ive got one light for 15 plants. im turnin next week
also ive took a picture of two jugs i was first usin the smaller one( giviin one full per plant) now ive changed to the bigger one . is that best?

heres the pics




heres some pics from like 6-7 days ago

hey man. LOOK!! You'r plants are doing great!
I was hoping they recovered from your problems a few weeks ago!

are you using nutrients?
Whats your soil Ph?
how far away is the light from the plant tops?

they look fine they could either be a little thirsty or overwatered also to cause them to look like that. but nothing i would worry about too much.