50nl- barrel this brd? or give up otf?

[unclesteve]

villain is 45/5, only 20 hands , no further reads.

Cereus Network - $0.50 NL - Holdem - 6 players
Hand converted by PokerTracker 3

SB: $52.30
BB: $46.22
UTG: $51.38
MP: $37.85
CO: $47.45
Hero (BTN): $52.20

SB posts SB $0.25, BB posts BB $0.50

Pre Flop: ($0.75) Hero has 6 8

fold, fold, fold, Hero raises to $1.50, fold, BB calls $1.00

Flop: ($3.25, 2 players) J A 9
BB checks, Hero bets $2.00,

Am I right to assume this is a hand where we can either ckbk and give up flop or barrel all three, coz he'll call 2 with all kinds of gutshots and 2nd pair type hands that fold by the river...?

Are there any runouts you give up on if you do decide to barrel?

Given that there's a fish in the BB, shoudl I be changing my BTN opening range to mix in more hands that will flop tp, and less hands that will flop draws, like this one? Or is it ok to open like 40% of BTNs here, assuming SB is a weaktight reg