The Broam has a much higher stack than the Checkpoint or the Domane. So no wonder you felt more bent over.
Also, the 56cm in one model of bike might not be the size you need for another model bike, even if from the same manufacturer. If you can test ride bikes, then try different size bikes of each model. Though if you want to sit up more, then also look for bikes with a high stack. A smaller frame of the same model will have less stack, a larger more stack. Reach increases some as size goes up. But depending on many other things, that might not be as much an issue.