You say that you can't cast anything without questioning its fluffiness.
Well... How do you answer that question, is quite important to consider. As in, you as an individual to take responsibility for your reasoning, and your actions, and your decisions and your choices.
Avoiding fluff, to me, actually goes a lot deeper and more dynamic than simply, "I'll just stick with the cool kids / the experienced people, and I'll just believe what they tell me to believe." Or getting XYZ ingredients together, go through step one, step two, step three, for a "non-fluffy realistic magic goal."
I mean... Realistic magic? To believe in magic at all would get us called "woo" or "woo-woo" which is the word for "fluff" used by people who don't believe in magic at all.
So, I couldn't just show you a non fluffy spell because it's not the spell itself so much as the one who is casting the spell: Is the caster very connected with their intuition? With the universe? Do they understand reality enough to know that this spell with these tools, with that action, with so-and-so words and at this time... is the best path by which they can make their willpower a reality? That's all it is.