I had a couple of similar spots with KK latelly and I wonder did I do something wrong in those hands because was told that I missplayed them.
Poker Stars, $0.05/$0.10 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.
SB: $11.85 (118.5 bb)
BB: $8.14 (81.4 bb)
UTG: $10.87 (108.7 bb)
MP: $10.15 (101.5 bb)
CO: $11.70 (117 bb)
Hero (BTN): $10.65 (106.5 bb)
Preflop: Hero is BTN with K
K
UTG raises to $0.30, 2 folds, Hero raises to $0.90, SB folds, BB calls $0.80, UTG raises to $10.87, Hero calls $9.75 and is all-in, BB folds
Flop: ($22.25) 5
7
9 (2 players, 1 is all-in)
Turn: ($22.25) 2 (2 players, 1 is all-in)
River: ($22.25) Q (2 players, 1 is all-in)
Preflop: 19/14 (37 hands) UTG opened and I decided to 3bet for value. I 3bet QQ+,AKs for value by default in this situation and even though he seems to be tight, I believe KK is still a value 3bet. The 55/37 (39 hands) fish joined and the UTG decided to shove. I believe folding would be too weak even though he is most likelly tighter than an average player. Furthermore, I have just 37 hands on him and no reads, so I don't like folding, especially when there is a chance that the fish will join.
The reason of that you are MP vs BU and that you are getting cold 4bet twice as much when in MP shouldnt make much of a difference. 
