Browning Tips - Problems, 5 weeks into flower

[Rusty Trichome]

Are you asking can I see any soil around the edges of the pot?

Nope. What's more abundant inbetween the visible roots? Air or organic matter? (don't destroy the rootball by checking inside the rootball)

No i'm not adding any source of calcium, should I be? If so could you advise me what I should do?

1 tsp unsulfured molasses per gallon of water, once a week from mid to late flowering, till harvest.

What can I do to counter-act rootbound without changing the pots?

Pray that rootbound isn't the problem.