are u using a lift or are u using a jack stand? if on a lift. have another person push down on the A arm and then u push in the strut. if using jack stands, same thing...have someone push down on the A arm. i know this because i did my suspension myself and when putting everything back together, i needed a hand pushing down the A arm. hope this helps.
@Donkey-Daddy_Digital has the idea of what the problem is. The hub is too high for the mounts of the strut.
@Daddy_Digital-Thanks, I was thinking the same thing as you. I used jack stands. and j I had two people pull down on the A arm. Still no luck. I needed another inch or so. I spoke to a mechanic about it. He said to pull the hub off. The springs are pretty stiff as they are brand-new factory springs. (Got really sick of true coilovers)