It would be good to see some photos of indoors compared to outdoors after a couple of months. Mine grow in a glasshouse so far so good but winter is coming here. They just seem to grow more slowly than the windowsill plants. They look maybe healthier though.
i grew mine outside in houston, had about 30 or so, then moved to central texas and left them outside even through the snow and am now noticing they are popping back up, though not as many as before, but thats ok because the year before i only had about 5. they grow pretty quickly.
I take excess gemmae and throw them in my bogs. My observations of these plants is that they develop at the same rate as the ones in my greenhouse but where some of the ones in the greenhouse sometimes make it past a year usually the ones outside croak - but not before developing a lot of gemmae in the process. I should also add that the most attrition occurs during the summer months.
"There is no pain as great as being alive,
no burden heavier than that of conscious life. "
I get mixed results. Some do better when outside and others either go dormant or die. I have a hard time with scorpioides, callistos, and dichrosepala when outside. And they have survived light frosts.