$33 6-max K6 fullhouse facing bet on river, how much to raise

[1outer]

3 handed, Aggressive player to my right and I have been staying away from eachother just picking on player to my left who is weak-tight and recently won AI PF pot with Q9o vs. JsJc. This player was very weak postflop and folded to every re-raise he encountered. When he raises me on the river, what do i raise to get max value out of my hand (pot? push?) He was defending made hands and from what I had seen, was not slow playing anything. Your thoughts?

Full Tilt Poker Game #2391724957: $20 + $2 Sit & Go (18090071), Table 1 - 50/100 - No Limit Hold'em - 2:05:21 ET - 2007/05/10
Seat 2: SeekingPlumb (1,960)
Seat 3: mcgrooge12 (3,665)
Seat 6: NINEACES (3,375)
NINEACES posts the small blind of 50
SeekingPlumb posts the big blind of 100
The button is in seat #3
*** HOLE CARDS ***
Dealt to mcgrooge12 [6h Kh]
mcgrooge12 raises to 300
NINEACES calls 250
SeekingPlumb folds
*** FLOP *** [2s Kc 6d]
NINEACES checks
mcgrooge12 checks
*** TURN *** [2s Kc 6d] [6s]
NINEACES bets 300
mcgrooge12 calls 300
*** RIVER *** [2s Kc 6d 6s] [Jc]
NINEACES bets 300

P.S. - Is there a reason why no hand convertor is working for Full tilt 6-max sng?