How do you hit pharah on freja?

I can't hit pharah for anything. I'm really consistent against grounded targets, and I'm decent, not great, into mercy, freja, and echo, but I have no idea what to look at to figure out which direction pharah is gonna move to lead my shot, and the distance changes so quickly.

What's crazier than the fact I can hit other fliers, is that I don't have the same problems on sojourn who's another projectile "hitscan," pharah is so slow.

Is there an aim trainer you guys use that mimics movement? Vaxta is okay, but pharah doesn't spawn in challenge mode and I don't like practicing without proper cooldown timers