An alignment is needed after a spring install. I am not very familiar with alignment, but did the ride height not go down when installed? Keep in mind it can take a couple hundred miles for the springs to "settle".
As for ride height- When you installed, did you make sure the bolts were all center in the white plastic ring attacked to the top of the strut?
And is possible the bottom spring did not reach the end of the curve on the strut? You have to twist the strut to get it into the hub, and it can dislodge the spring and make it off centered. I had to take out the strut, recompress the spring until I could get it to move, and moved the end coil to the twist of the strut.