Exliers?

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So i've been trying to understand how adding or combining exliers effect each other like for example i would get a 1.5 combo from blessing and i would buy a 7k 1.5x combo off plat store and it would seem like im hitting weaker then when i just had 1.5x combo. Is there a thread that explains what happens when you combine exliers and if they stack? feedback is appreciated EDIT : Also i dont need an understanding on xp i just want to know if the luck and damage stacks on 3x, 1.5x, and 1.25x.