It's true that thicker wire (lower gauge) has less resistance per foot. But that doesn't mean you always get a low-ohm build. If you wrap a thick wire around a small inner diameter, you might end up with a coil that's too long to fit in your deck, or one that reads higher than you expected because of the added length.

Here's a practical example: a 26-gauge kanthal wire at 3mm inner diameter, 5 wraps, gives you around 0.8 ohms. If you switch to 24-gauge, same wraps and diameter, you'd drop to about 0.5 ohms. But if you add two more wraps to that 24-gauge, you're back up to 0.7. The wire gauge and wrap count interact—you can't change one without considering the other.