I wear essential oil blends on a daily basis. If I use spray pheromones under these fragrances, will the oils carry the pheromones further?
Most likely, they will reduce dispersal. Sort of like a heavy blanket, but the mones should last longer because of it. Oil carrier mones tend to last longer than alcohol carrier ones.
So maybe a combo of a spray on the back of my neck and the application of a few drops of oil on the wrists? I want to balance the effects of both.
Yep, it’ll last longer, but it will slow down the diffusion, and imho it could also decrease the amount of hits you have, because the oil just slows it down and it’ll take a bit longer for people to get a waft of it. Yep, your pheros will last longer that way…but really why slow down the fast effects you can get?
Because I love my oils so much and I think they also have an effect on the people around me 
Aww, how cute!
I’d suggest to use the your oils beside your pheros instead of layering them. But hey, do what you’re comfortable with
Beeks, the colder weather, in the northern hemisphere at any rate, that comes with winter may slow the diffusion of even alcohol-based sprays considerably. Unless you are indoors with the pheros, of course. I don’t know where your location is, but, over the winter, at any rate, I’m going to go with the sprays (apart from A314, obviously) and not cover with any EOs. But I’ll probably use the oils beside the pheros like Msselva says.
Whereas next summer, should the weather get hot again, that is a better time IMHO to actually layer the EOs over the top, slowing diffusion to compensate for the faster diffusion-effect of the heat.