Hi Photoman-
It is good that the potash and phosphorus are high. Sounds like you do need nitrogen, so then it just depends on if you like regular chemical fertilizer or have decided to go with organics. Composted manure is probably a good source of N for you but I might do a shot of chemical fertilizer myself.
It seems to me you checked the nutrients because your plants are not growing well.
A large part of this could be it is just too cool still.
Tomatoes and peppers and other tropical plants are really stressed when it gets below 50 degrees-around here even this last week it was still dipping below 50 often at night. They get stunted, don't grow, and look like yours. It may have been a bit early to set them out, unprotected.
