Kypro, I understand your dilemma, but not your reason.
You have a Fatboy which gives you a great shave, as does mine,..why don't you replicate the scientist's recommendations with the Fatboy?....makes sense to me.
If you put twelve shaving forum members in a room and ask them your question, you'll get sixteen different opinions.
I have no problem with RAD,..I have, on occasion, been on the verge of pulling the trigger on the superb examples of the modern razor maker's art.
I bought a Fatboy and subsequently, a Slim,...I no longer hanker for the latest bling, they CAN'T give me a better shave than those classic Gillettes.
Choosing a razor is very subjective and unless you can try before you buy, it can also be very expensive,...there is a reason why the BST sections of shaving forums are the most visited.
The only question to ask is of yourself,..."Do I want a lovely, shiny, new, modern razor,..or do I want a great shave, which I can get from my current razors?"
PS,...I'd go for the bling (cough)