according to greg green's cannabis grow bible, once you decide on a photoperiod, you should keep it until it's time to flower ( 24/0 the whole veg time or 18/6 the whole veg time).

keep temps between 75-85F otherwise growth will not be as rapid

the "educated ones" you called upon will in fact be more likely to give good advice if they aren't initially dumbed down by the way you type.