BTN was playing around 45% of hands and 3 betting around 30% of the time, always through very small 3 bets (min raises). HJ was raising around 40% of hands.

NL Holdem $0.05(BB)
HERO ($5)
UTG ($2.95)
HJ ($8.96)
CO ($3.06)
BTN ($9.04)
Dealt to Hero: Ad Qd

UTG Folds, HJ Raises To $0.10, CO Folds, BTN Raises To $0.25, SB Folds, HERO Raises To $1.12, HJ Calls $1.02, BTN Calls $0.87

Hero SPR on Flop: [1.15 effective]
Flop ($3.38): 5c Jd 9d

HERO??

These guys have been playing very loose and flatting 3 bets pretty often. I decided to size up on the 4 bet, let me know what you think about the size and maybe some suggestions on 4 bet sizing vs loose callers.

On the flop my remaining stack is 3.88 so just over pot. With roughly 1:1 SPR how would you proceed?