The RM2 is definitely capable of flavor overdose.
I DIY my liquid, and basically vape 5% flavoring, 95% unflavored nic base. Before the RM2, while using Gennies or other tanks, it was at the very least 25% flavoring I was mixing in. Started knocking the flavor percentage down batch by batch, and was pretty surprised how low I could comfortably get the percentage down to.
I also use an Origen on a Hammer, and vape much stronger flavored liquid in that setup (12%-ish), but I only rock that while watching TV in my living room. That setup lives/stays on my coffee table, and I'm never using it longer than 2 hours max maybe 2-3 times a week.
Otherwise, it's obviously not the Reo, it's what you put on top of it, the build, and the juice you vape. The Reo is just a mech with a rock solid juice delivery system.
On a related subject, maybe this is a good cue for you to hit the DIY forum and look into that. I ditched vendor juices last summer, and doing so has definitely benefited me. It's a fun enough vaping related hobby that easily replaces "shiny-itus" once you get a dependable and consistent setup/platform like a Reo. It's about as difficult as being able to add cream and sugar to your coffee.
DIY saves you mad cash. One of the aspects of vaping that helped me stick with it was the fact that it was saving me $13 a day in expenses compared to smoking. You get to that point, as a bonafide non-smoker, where you wonder why people spend that kind of money on cigarettes. Now I'm at a point where I wonder why people spend that kind of money on vendor juices. I go through maybe 3-4ml a day, and I reckon DIY costs me maybe 10¢ a day?
Also, and I'm not a conspiracy theorist, but who knows what the hell your favorite vendor is putting into their liquids. One thing's for sure, there is red food coloring in your "unicorn blood". And seriously, why the hell is that necessary? Seeing your pink soaked wick is alarming to me. Not only does it look like a used tampon, but that crap can't be good to inhale. The biggest unknown about our vaping habit's safety is the chemicals in it. Outside of PG, VG, and nicotine, ALL the unknowns and potential danger lay within the flavoring. The flavoring, and more importantly food coloring that isn't even needed, is made for ingestion, not inhalation. The closer you are to pure unflavored base, the safer it is. So if a tiny little RM2 allows you to knock the flavoring percentage down big time, I view that as a massive benefit of the device.
Cheers
