Controlling the trajectory of iron shots can be tough especially if you have one speed or length of swing for every shot.
Let’s think short game for a minute, if you want to hit a low running chip shot you keep the club low on each side of the swing and that produces a low trajectory shot.
If you want to hit the ball higher you take the club above your belt on each side of the swing letting the height of the club drop on the ball and cause higher trajectory.
So to control height in your shots take a little extra club and feel a lower to lower motion in your swing taking a little steepness out of the strike and causing a lower shot.
Remember when talking length of swing, low to low will cause a low shot and high to high will cause a high shot! Sounds simple but work on these shots and don’t be afraid to change that swing length from time to time! Good luck!!