So I had a to-go bottle of P74 from an order I placed a while ago, it was a freebie (standard 5mcg/spray).
I applied 4 sprays after getting to work in the morning. During coffee break in the cafeteria, while on-line talking to several of my colleagues, one of the women I was conversing with (close proximity to me, only a few feet) just randomly started getting really happy. She couldn’t formulate sentences properly - its as if her brain just sort of turned to mush. We parted ways and the day continued as normal - but I ran into her again later in the day. It had the same sort of reaction a few hours later. Complete elation in a matter of minutes.
Has anyone else had this kind of an experience with this putative?
I’m wondering if I used too much.
I’d say you used about right and she’s getting it nicely. 
20mcg can be very effective in a work mix to help get people to “bond” with you - and the effect builds on repeat exposure, to the point they can be hanging-on your every word. You can go-higher in professional mix to emphasise the bonding/trusting/engaging properties but as you go-up, any romantic/sexual qualities go-down.
Although professionally, IH, A314 or A314/IH complete the picture to help make that all-round engaging/trusting/“expert” vibe.
Consistent A314/IH/P74 can also encourage a kind of “crush-on-teacher” response, which whilst fun, can get awkward - which is why I backed-off regular use at work as it was getting noticed - in all the wrong ways. I now save the mix for individual situations/short-term (events/conferences etc) where I need to get sometime difficult people on my side, quickly and with the minimum of fuss. 
I have luck with just 5 MCG even and I sometimes will use 10 MCG with work. I do notice even for myself I get this happy feeling and so do others I come in contact with. It is weird as I hear most use around 20 MCG as I have found I only need 5-10MCG at the most.