At 1000bb the hijack pays for its steal-width with a narrow, nutted continue range — as it should.
4-bet almost nothing but aces. Even KK often prefers a call — building a 1000bb pot preflop with one pair is a strategy of despair.
Your hijack steal ran into the cutoff's 3-bet — position against you, and a range that knows your open was wide.
Assumes a standard 3-bet; 4-bet to ~2.2–2.5x the 3-bet. Deep, favor calls over 4-bets — a 4-bet pot at 500bb+ commits you with range disadvantage.