Anyone got any good rules of thumb for ICM situations / a mental checklist? I know +cEV shove/fold well but don't have ICM tuition and it frequently gets me into trouble.

Example bustout hand from $22 mini supersonic below approx 630/1250, top 630 or so paid:

Table '2962248053 175' 6-max Seat #4 is the button
Seat 1: AceSweaty (23280 in chips)
Seat 2: rmpkrbr (20672 in chips)
Seat 3: sultanhenkie (70618 in chips)
Seat 4: Schmutzig (54096 in chips)
Seat 5: jdog199 (15402 in chips)
Seat 6: stannie1997 (25840 in chips)
AceSweaty: posts the ante 400
rmpkrbr: posts the ante 400
sultanhenkie: posts the ante 400
Schmutzig: posts the ante 400
jdog199: posts the ante 400
stannie1997: posts the ante 400
jdog199: posts small blind 800
stannie1997: posts big blind 1600
* HOLE CARDS
Dealt to AceSweaty [As Ts]
AceSweaty: raises 21280 to 22880 and is all-in
rmpkrbr: folds
sultanhenkie: folds
Schmutzig: raises 30816 to 53696 and is all-in
jdog199: folds
stannie1997: folds
Uncalled bet (30816) returned to Schmutzig
FLOP [3s 8c 2d]
TURN [3s 8c 2d] [Kh]
RIVER [3s 8c 2d Kh] [3h]
SHOW DOWN
AceSweaty: shows [As Ts] (a pair of Threes)
Schmutzig: shows [Jh Ah] (a pair of Threes - Ace+King+Jack kicker)
Schmutzig collected 50560 from pot
AceSweaty finished the tournament in 1185th place
SUMMARY *
Total pot 50560 | Rake 0
Board [3s 8c 2d Kh 3h]
Seat 1: AceSweaty showed [As Ts] and lost with a pair of Threes
Seat 2: rmpkrbr folded before Flop (didn't bet)
Seat 3: sultanhenkie folded before Flop (didn't bet)
Seat 4: Schmutzig (button) showed [Jh Ah] and won (50560) with a pair of Threes
Seat 5: jdog199 (small blind) folded before Flop
Seat 6: stannie1997 (big blind) folded before Flop