It is perfectly okay to layer your pheros to achieve effects that come only from combinations.
BUT - you really need to know what each one does first, and find your sweet spot with each one. This refers to the optimal dosage that will get the best results. For each person it is different, and it can also change as you age. Try one phero at 1 spray for a few days, then go up to 2 sprays, 3 and so on until you find the level that is getting you hits.
After you’ve done this with the pheros you buy, you’ll know them well enough to start layering.