Big $2.20 AK Iso raise. Called by 2 but misses.

No Limit Hold'em Tournament T1,800/T3,600/T450
Buy-in: $1.96+$0.24 USD Hold'em No Limit
PokerStars
9 players
Formatted by pokercopilot.com: Poker HUD for Mac and Windows

Stacks:
UTG - UTG (T104,768)
UTG+1 - UTG+1 (T146,389)
UTG+2 - UTG+2 (T175,988)
MP - MP (T183,621)
MP2 - MP2 (T100,331) 15/6/0 [VPIP/PFR/3B] 286 hands
CO - CO (T55,528)
BTN - Hero (T228,054)
SB - SB (T150,520) 20/5/0 [VPIP/PFR/3B] 41 hands
BB - BB (T5,668)

Preflop: (T9,450, 9 players) Hero is BTN with A♥ K♦
4 folds, MP2 calls T3,600, 1 fold, Hero raises to T12,800, SB calls T11,000, BB calls T1,618 (all-in), MP2 calls T9,200

Flop: 9♦ 4♥ 7♣ (T47,668, 4 players, 1 all-in)
SB checks, MP2 checks, Hero checks

Turn: 3♥ (T47,668, 4 players, 1 all-in)
SB checks, MP2 checks, Hero checks

River: 4♦ (T47,668, 4 players, 1 all-in)
SB checks, MP2 bets T7,200, Hero???

Iso raise with AKo is pretty standard, I think. Two fairly tight players call and so based on having 2 players call and their tight stats, I essentially just give up on the flop. Is this too tight, given that there is some dead money from the all-in player?