Struggling with dwarf tomatoes

[Fritz77]

This is my first attempt to grow dwarf tomatoes. My seeds germinated easily and most of the plants look healthy and vigorous. Now, the problem is that my plants have been transplanted 3 weeks ago and don’t have any blossom yet. The 3 varieties I grow are: Uluru Ochre, Wherokowai (see pictures) and Wild Fred.
I’ve fed them and all my other plants with aged sheep manure and only once with Compo Fertilizer (9-5-13) which is a little high in Nitrogen but I guess not so high right?
So what's wrong with them? To be honest it looks like all my plants don’t have too many blossoms this season.
Are dwarf tomatoes late bloomers or is it me failing miserably?