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I have acquired a taste for spicy foods too. To me it is not that hot. I tend to taste the cinnamon first and then the other spices. Garam Masala is made in different regions using different spices. I think you should be able to find a spicy hot garam masala. Like:
Zafarani Garam masala Hot Spicy Powder
or
Tikka Masala Hot 2.0 oz by Zamouri Spices

The Tandoori Chicken Tikka I make is really spicy hot.

Description for the Tikka Masala: Zamouri Spices presents a Tikka Masala spice blend that will rival your favorite Indian restaurant! Our version of this beloved dish will tempt your Tikka Masala craving palate. Ingredients: Hot chiles, paprika, turmeric, garlic, chili flakes, ginger, cumin and other spices.

Have a great week!
Steem on,
Mike