v is 28/21 9% 3b. 33% raise cbet (6). Only recent history (arguably irrelevant) is he stacked me earlier when he c/r KK as pfr from utg (fr)on 677cc and I 4b/c AQcc.

I was thinking that calling gives him the opportunity to continue bluffing. But, that allows him to play perfectly on the river in terms of bluffing frequencies. As I don't have many reads on his tendencies I'm unsure what the optimal line is here.

Stacks:
UTG LeRhaqs ($2,340)
UTG+1 gregy20723 ($1,000)
CO cadillac0001 ($280)
BTN fantasticcow ($1,759)
SB Hero ($1,977)
BB Altrum Altus ($1,000)

Pre-Flop: ($15, 6 players) Hero is SB
LeRhaqs folds, gregy20723 folds, cadillac0001 folds, fantasticcow folds, Hero raises to $30, Altrum Altus calls $20

Flop: ($60, 2 players)
Hero bets $40, Altrum Altus raises to $127, Hero calls $87

Turn: ($314, 2 players)
Hero checks, Altrum Altus bets $218, Hero ?