Hi Nep,
Hope I can help. I have sort of the opposite problem, but I might have some insight. I've noticed that my Red Dragon doesn't like to be quite as soggy as my common and Green Dragon.
My plants don't get full sun because in my case they may burn (Zone 9/10/11) so they're sitting in all-day indirect light in a northern facing window.
For my common and green dragon, I keep their trays filled with loads of water so that they're sitting in it 24-7. For the Red Dragon, I put a bit less so it's in it water for about 15 hours, moist but not soggy.
I had noticed that Reds and commons's emerging traps can rot sometimes with cold/water. My red did much better with less moisture. The red is actually doing better than the 4-year old common (recently put it into hibernation) and growing traps as quickly as the Green, though the leaves are shorter.
BTW, I got the Red and Green here at Exotic Gardens! :biggrin: