Photos taking up too much storage space
I have a 128 GB iPhone 7. My photo library is about 340 GB, I've turned on optimized storage on my iOS 11 phone.
The Settings app is showing about half my storage being taken by photos, but if it is actually taking 97.82 GB then it's more like 76% of my storage. I keep receiving low space warnings and my phone is slowing down due to lack of space. Any ideas on how I can force photos to take less space? The photos app says it's "Updated" at the bottom and I've been on Wifi all day, so it should have been able to sort itself out. I've tried restarting the phone, with no change.
iPhone 7, iOS 11.0.3