Tactiful positions are always present, seeing them on the other hand requires either a good eye for the position and complex series of moves that may follow, or experience/hard work. Tactics on the board simply mean a series of moves that, when completed, attack a position or positions which result in a heightened confidence level.
If you want to improve your ability to see and foresee tactical issues then begin working on citing and using such moves as the Skewer, Pin, Fork, and any variation thereof. Mastering those three alone will allow you to begin seeing quite a bit and should allow sharper, faster attacks.
In many of my games I tend to play "positionally." With White I try to play systems that get me out of the opening quickly and with Black I tend to play 1.d4 d5 and 1.e4 e5 positions where I just try to swap some pieces to deal with the space problem and play on from there. While this works well enough I am neglecting tactics and tend to blunder material. I usually only see tactics when the opponent has blundered and when I do attack it tends to be with slow pawn storms.
I would like to play more tactically in the middlegame but I don't know how to get such positions.