I've done the same. I have another Buddha Mini tank at 1.6Ω that's on a Provari 2.5, I switch it to the Pico and match voltage, there is a bit of a difference. Not enough to claim one is better than the other, but it is there.I don't know or understand all the science parts, but I believe you when you describe your experience.
I have and use the Pico with Melo 3 mini that came as a kit. I am currently using the .3 coils in my tanks. I also have several different Provari (this is where the my mod can beat up your mod comes in) that I use with a Nauti X and 1.8 coils. Mostly I use the Radius because I like the box style, but the tube mods are good too.
I started with a Pico kit, but when I got my first Provari, I was able to tell the difference between them with the same tank, same juice. The Provari was much better, but you run into limits on the power the older Provari 2.5 can deliver. At the time, I was using Triton Mini tanks with 1.2 or 1.8 coils because the Nauti X hadn't been released yet.
I still use the Pico kit because I have a couple of juices I like that really sing in the Melo 3 tank, and they work well enough with the Pico that it is easier to deal with the short span of battery life and tank filling with the sub ohm set. If you aren't stuck with one juice, maybe you can experiment and find one that works well with your Pico kit and let that be your travel kit so the mech can stay at home.
confession time: for short trips in the car, I still like my Blu Plus kits. Not the greatest vape, but very purse and pocket friendly. I still have trouble driving without a "cig" between my fingers on the wheel.
If you can get verified, you might be able to pick up a Provari in the classifieds section on ECF. There are other mods and tanks in there from time to time as well. If you know any vapers IRL, you might see if they will let you test your tank on their mods to see how it works for you.
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And I often go out for errands with an EVOD.