Welcome Steve. I’ll take a shot at answering some of your questions.
1 - This forum is hosted by Androtics and most of the posters here really like their products.
2 - I sometimes mix with perfumes for mixes I know I really like. The mixtures seem to keep with no problems. More often I find myself simply spraying on pheromone, then spraying on scent over the top. That gives ongoing flexibility. Once you mix it in a bottle it’s hard to unmix.
3 - ? I don’t know. Perhaps someone else will.
4 - Anything has plusses and minuses. Too much anone can cause aggression in males and irritation in females. Some people think ishine smells bad. Sometimes people wearing IH hear things they would rather not have heard.
5 - If you meet the qualifications (in a sticky post at the top of this board) you can get a gift certificate that will offset the cost of an initial order.
6 - ???
You might find some companies doing free samples but you are better off sticking to https://a314.com/ and buying togo bottles of the ones that interest you.