u/Impossible_Yak_6341

I started LST training way too late but my plants are now around day 50 and have already started flowering for a couple weeks, I know the brown tips could be Nutrient burn so I've only been doing water for a little while, is it to late to top? Or try to make more flowering spots? Or will taking leaves off help? Its my first grow so I'm learning still

I have these 4 plants at day 43, I know i started the LST a little late especially with the really tall one but is there anything else I can do. Also what are the yellow spots on the leaves, Ive taken off a couple bad yellow looking leaves and some leaves look like have holes that look like maybe pests. Overall thoughts?