Some background.
I've been playing with factory and shop restock automation and the only thing I have an issue with is the Storage blocks register as being full or 100% when the sensor block doesn't see this. I believe this is because the max limit is 1 block short, e.g. Storage block filled with Grey Hull = 1999 blocks.
I've only tested with grey hull so far, but have found that if I place the maximum block count + 1 block into the storage block it correctly registers as 100% with the sensor block. Taking grey hull as an example, I drop 2000 blocks into the storage and my sensor registers 100%.
I've tried finding a bug report matching this, so I suspect you most likely know the issue. But I thought I better log something in case it isn't