Hey Andrew,
It sounds like you are doing pretty well. You put money aside for retirement, live the good life, kids get pretty much whatever they want, spouse gets new stuff all the time. That is all great.
I really dont believe people need to sacrifice. I think you might need to have a serious heart to heart talk with the spouse and teenagers. Let them know that they are going to have to start paying for things themselves. Expenses are going to have to be cut, just a little, maybe 10%, 15%. Put the 401k money from now on into real estate. Instead of contributing to retirement at work, put that money into the next house. Keep it up.
Keep the car until it hits 100k miles instead of 40k miles before you get a new one.
If a man has 10 pairs of shoes in the closet, thats plenty, women 30. My wife had over 50. I just told her, "I am not trying to control you, and I would never say that you can NOT buy something. Just really think about what you are doing and do you really, absolutely need that next pair?"
Just be a little more frugal in life.
ps I dont think you need to be creative, just cut back "un poquito"