At 1000bb, the big blind defends with the whole suited deck and a plan: hit hard or fold fast.
3-betting is nearly reserved for the top of the deck. Position and nut potential dictate everything else; offsuit broadways are mostly gone.
Big blind versus cutoff: a wide open meets the discounted close. Defend broadly, and make the suited hands do the heavy lifting.
Assumes a ~4bb open; 3-bet to ~3x the open in position, ~4x from the blinds — larger as stacks deepen.