Use the NPC. The My Intuition is a generic type thing that isn’t dialed in.
Hopefully it will be affordable for you. But you’ll never know til you see the offer as all schools calculate need differently.
Your question about “stackability” - could easily be asked. So write or call the financial aid department and ask.
Good luck - I hope the price comes in right for you or that you have affordable alternatives.
Best of luck.