When aiming for strength gains, utilize slow negatives and explosive positive movements.
Slow negatives require you to perform a tempo which is slow as you lower the weight. An example is 3-0-1, which would see you count three seconds as you lower the weight, then take only one second to lift the weight.
Another is 4-1-1, which would see you lower the weight for 4 seconds, hold it at the bottom of the movement for one second, then explode the weight up in one second.
The explosive positive movement is important for building power.