Fast Buds Purple Punch, first grow ever.

this week has been a lot of readjusting the soft ties i added last week. everyday it seems to stretch another 1/2 inch or so and i have to pull each brance outwards again. i started lst a bit late and didn't defoliate before preflower started so im not sure if i should just wait until before harvest to get rid of some of the under growth or what. also not sure if i should stop the grow big and just use tiger bloom now or use both still now that preflower / flowering is starting. the fox farm feed chart says to keep using both but im hearing conflicting answers online.