I'm going to do similar things. I also want to try the Vermont Vapor 3.5% nicotine that has citric acid, and compare that with Juul juice cut down to 3.5%. I'll first estimate the VG% to try to match them to get good comparisons, and to try to judge the role of VG in taming the "bite" from the nic.I'm not convinced that the overall bio-availability is higher, just the speed at which it gets into the bloodstream (and thus to the brain). That speed is is something vapor products have lacked over combustible cigarettes, and I believe the lack of it is one reason why so many who try vaping find it unsatisfying and revert to smoking.
If I get some juul product, one of the things I figure I'll do is to break open one of their pods and cut their liquid down to somewhere in 15 mg range that I normally use and see how it works that way in my own gear.
I'm way ahead of myself. The Vermont Vapor stuff I want to buy is sold out, for now, and Juul hasn't gotten back to me as of yet. I'm making up for not being crazed about the latest and greatest flavors and gear, by getting that way about the nicotine.