If that bothers you, don't develop the bishop to d3. On the other hand, c4 is a positional mistake by black, so it should not bother you.
The most important thing is that you should not think about opening lines at all. You should focus on improving your middlegame skills, mostly tactics. You tried a grand total of 3 puzzles? Seriously? That is the best tool to get better at chess.
Not really sure if this is the right place to put this (please refer me to the correct place to do so) but often when playing the London system I come across this situation and I have just no idea how to counter it. As you can see, my bishop on d3 is threatened and after moving back, I lose my positioning and my entire game just begins to fall apart.
