Nice journal, nice attitude. Great work. I’m sure you’ll ask Dee A. to remove the word skeptical from your journal’s title real soon, dunno, I have that feeling 
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Please read this link, it is the masters list of IOI (i.e. indicators of interest), this will help answer your question “how do I know if pheros work”: How to Tell a Woman is Interested In You -- The Master "Indicators of Interest List"
Personally, when I want to layer, I wait until total drydown of the first layer, this can range from 2 to 4 minutes in most cases. Products are somewhat volatile. It can take a bit longer in very humid summer months. Layering is good, but I’ve had my most crazy hits with separate points of application so far.
Your mix suggestion sounds reasonable, but I won’t stress enough the importance of testing each product solo and find your sweet spot for each 
. IS and IH is a killer flirting combination in most cases when used with a mild sexual (like Ammo) or overt sexual (like TUTH). IG will give you the edge with asian ladies. They are simply aroused by it… the manly vibe, I guess, gets to them.
Normal body soap does the trick, but if you use androstenone-containing products (like TUTH, Ammo…) don’t be afraid to scrub with a washcloth also, this molecule tends to cling a lot to skin, and once fragrance is gone, stink can result in some cases. That’s why one never applies TUTH or such to the hair. It’s nearly impossible to remove from there (lol). You can heed to Justintime’s suggestion on the tea-tree bodyscrub, he has quite the expertise on natural personal care products. I just ordered a product free of those darn xeno-oestrogens (like the cocoamides or laureth sulfate things that are everywhere on the shelves…) that he recommended and I can’t wait to try it.
Bring all your questions on, there are no stupid questions here, we are happy to help. And if we don’t know the answer, we sure have a few Yodas around who will .
18-25 are young girls (or women) in my book, but they’re so delicious .