I'm confused. The starter was crushed grains and water? Where is the sugar for the lactobacillus to work on? I guess it could work on the starch, but simple sugars are easier for it to breakdown. Should have used some sugar water.
You certainly seem to have gotten something working in there. Without any sugars, I suspect it wasn't lactobacillus in the starter.
Lacto doesn't like hops much. I usually don't use any.
1.054 to 1.020. Something is working in there. If it isn't sour, it's not Lacto.
You've got something, but it isn't a Berliner Weisse.