If you have a single effect with multiple mods that multiply the same attribute, it should yield the same result. Maybe I’m not understanding what you are saying.
If your attribute starts at 10, and you multiply it by 2 three times, you get 80, no matter whether it’s
10 * 2 * 2 * 2 (your way)
or
((10 * 2) * 2) * 2 (my way).