Wow, two smilers in the same house. Only about 50-60% of them smile. Deco was big smiler on top of being a big talker. We had a male named Data (he came named that way) and he talked a little bit and never smiled.
Back in the 1800's & early 1900's Dalmatians were used in circus acts. They really are very smart. But they can be very, very stubborn too. A lot of people who aren't that familiar with the breed think they are stupid. Not true, just stubborn. They know what you mean and won't do it until they want to. Positive reinforcement repetition training is what works with then. Rough handling can make them very resistant to further training. But is sounds to me like you have it right since they are learning from you.
Funny Dalmatian story for you.
Years ago when I had my Dalmatians at work the subject of dogs came up. One woman said that "My neighbor has a Dalmatian, but I think something is wrong with it." I asked her what was wrong with the dog. Her response "It doesn't have black spots, it has brown spots. She took it to the vet and the vet said not to worry, but the owner still thinks something is wrong with it to be that color.".
I thought you'd like that one.