@Break-19 I know he used/uses the TFV4 on the RX200 so he might have some insight on that thing.
I don't have that mod, want it, but don't have it because, well, like I was saying you don't need to go crazy, I'm in the same boat. What I have powers what I use more than well enough and therefor I can't justify throwing extra money out there. I mean I'm sitting here with an unused Sigelei 150w already, why would I want to retire another mod just to get the same vape? But, I'm a bit different than you as I don't value aesthetics as much, my brother's wife calls me a Functionista.
The DNA chip is the standard premium chip, it's your top of the line. Again though, until you start using temperature control or pushing the limitations of the mods you have (really no need and even if so it'll be a while till you do) you just won't be seeing any gain from it.
Put that RDA to use! yes it's inconvenient but there's nothing better to learn coilbuilding on, you won't waste nearly as much juice as you would learning on an RTA and in general it's easier to build on. Once you get coilbuilding down then it's just wicking, which each RTA is a bit different with, so jumping in head first on whatever RTA/RBA you end up using won't be a bad idea.
Last thing, Rip Trippers is a youtube sales person. He's an advertisement avenue for the people that make these devices and not much else. Most of the big Youtube names are the same, they don't give their true opinions they just build up hype for the item they were sold. Now, within that when you read between the lines and just look at what they're showing you get a lot of great information, but just don't take their misleading "opinions" as fact. Just be a skeptical viewer/consumer and don't throw money at every shiney they promote or you'll find yourself running out of vape funds for something that is really worth getting.