+350 @ 20k @ 25NL is roughly 3-4ptbb/100 (someone check my math).
that is good, but not great (move up when u get to 5)

while 12 buyin swings are common, i really doubt it's completely luck and you're probably tilting, and because you're tilting you're playing bad too.

hand 1: bet the turn, check river.
hand 2: bet the turn.
hand 3: nh
hand 4: looks like the river saved you. i'm not putting a 4bet on the flop, and i'll wait for a safe turn to be more aggressive.
hand 5: call.
hand 6: fine.
hand 7: i'd raise the turn. as played i'm not folding. pot is $13.25, and it's $4 to call.
hand 8: fine