Here's my two cents for what it's worth.
On your D. Anglica, it is indeed forming a winter resting bud. Temperature is not the only trigger for this action. Light is another big factor. For instance, I have two D. intermedia, they are similar to D. anglica in the way they form the winter resting buds. One is outside and is growing great in my bog. The other is still inside under my grow lights. The temps inside are above 80 degrees and only drops a couple degrees at night. It has formed a winter resting bud as well. The problem isn't temperature, it's light. Clint is right, your plants aren't getting enough light. They all need to be left outside, rain or not. I live in North Carolina, not far from VFTs nature habitat. They get rain, hail, freezing temperatures, not to mention hurricanes and everything else. Leave them outside. Regarding the dew washing off your Drosera, they make more. I keep D. capensis and a number of other Drosera out doors, right out in the weather. When it rains, the dew comes back within a day or two if it's washed off at all.
Flowering does not always mean the plant is doing well. It is also a last resort in propagation before it dies.