Ok...
If you want to make the troublesome attys work, I have a solution that should work....
Good news, and bad news... Even though my Gemini RTA works great on the Cuboid, I was able to reproduce the same issue on the RX200! Here is what I found.... Without a spacer, if you screw the atty down too much it will cause the problem exactly as you described! With the spacer it seems to work much better, but still not 100% as well as the attys that don't need the spacer!
While testing I had two things happen :
The first issue was the mod would go into Temperature Protection IMMEDIATELY as soon as I pressed the fire button! I also noticed, it was displaying the resistance of the previous atty I had on, it never asked if this was a NEW atty/coil. If I switched to wattage mode, it displayed the correct resistance. So, switching between the two modes showed different resistances! The one in TC was WRONG, the one if wattage/power mode was correct.
After I played around with how tight I had the atty on, it then asked if it was a new coil, once I selected yes, then I had the same issue as you!
Playing a bit more, and loosening the atty made it work correctly!
I then did the same procedure with the spacer on, and MOST of the time it just worked, but was sensitive, it seems like the RX200 needs more than a 1mm spacer with the Gemini.....
So, if you want to, you can try some spacers, start around .5mm and work your way up...
and yeah, it sucks! All of mine work GREAT except the Gemini... So,
Tobeco Velocity Clone, SMok TFv4, Griffin, Mutation Xs, Kanger Subtank Mini & nano...
Ironically, the SMOK TFv4 which works fine, is the first one I remember people reporting issues on, and Joyetech saying it would cause a problem and they wouldn't honor warranty if you used it...