Hello Wilks
Ready for another go at the store 
A few words on what you have already
Instant Openness is a chatty fun mindless mix. It conveys friendly safe approachable. Often when I wear it I find myself telling people to shut up. LOL This from a person who is famous for her ability to talk your ear off 
Turn Up The Heat, not sure where you using it environment wise but you will get the best results from it wearing it to places where the ladies can openly express there sexuality and arousal more. You wear it to the super market (for example) and two things can happen depending on the ladies personalities. Some will think your giving off a creepy perv vibe that can make them uncomfortable and others will become aroused but they will mask those feelings because its just not the place to be hitting on a guy sexually.
Now wear it on a date, to a club. Parties, or with your SO and you will get much better hits. These people have comfort with you or are in a place where arousal can be expressed more openly.
On the mention of comfort with Turn Up The Heat. Its good to combine it with products that make people feel more comfort. Instant Female Magic, Instant Honesty or P74 would go well with it. Instant Shine and Instant Openness are good but not my first choices coupled with it.
OK on to your second order
I would suggest Instant Honesty, Instant Female Magic, AMMO and P74
Let me ask why do you think AMMO is not right for you. You could get the same effect if you mixed the same 3 pheromones in the same 3 ratios with the exact same steering components added but its not likely.
I think it would be perfect for you for day wear and then you can use the Turn Up The Heat for special occasions.
Instant Honesty, after your description of the 18 year old check out girl I think this would suit you better. Its more deep and connecting.
P74 is bonding and friendly
Instant Female Magic is calming and gets rid of last minute resistance (as steveO calls it) LOL This just means if a girl is saying no due to nerves or feeling uptight it will help get past that. If she is saying no cause she really dosnt want to then your shit out of luck. Remember no is no, no matter what 
Are you outgoing wilks, willing to make the approach ? If so then A314 would be good for you. I usually wait to advise this to the shyer men till they build some confidence in themselves and the pheromone products.
There as different as night and day in my opinion.
I can only tell you the reactions I have seen and the way I feel myself when wearing it. Keep in mind its experimental and I am unusual LOL
P83 when I wear it I dont feel aroused exactly, more sensual. I feel like seducing. I am more expressive, flirty flamboyant. I notice men and women peacock more. That means display. They loss inhibitions in the right environment. If I want a sure fire way to wake my hubby up and get some I war P83 plus cops 
P79 amplifies or intensifies. It can make a mix more expressive. On its own I find everything seems amplified. The sky not just a pretty blue, its majestic. That guy is not just good looking, hes fuckable hot. (sorry for the language LOL) It takes whatever is around or whatever mix your using and makes it better. Hard to explain because it can evoke so much depending on the situation.
Tisha