Dear Göte,
my experiances were the same.In small pots orchids (Pogonia, Calopogon) never flower and never grew bigger.
My swamp is 10 years old, 4x 2 m² and 60cm deep with 6m³ peat.I have started with 3 Pogonia and 1 Calopogon.Now there are hundrets of Pogonia and many Calopogon inside.
I would like encourage you to biuld a swamp in your garden, as greater as better.You need a sonny place and a lot of rainwater.
In the first years i have lost a few Sarracenias in winter, especially S. minor and S. psittacina are susceptible to froozen temeratures.Here in clima zone 6b I cover the swamp with a "Frost protective cloth" (Is it the right word ?).With this pretection I have never lost a plant, and semihardy plants like Drosera binata, Drosera filliformis stay in the swamp while winter.
In my opinion the greatest point is to protect against wind (dehydration),It`s more important then protect against froozen temperatures.