Transplant them now. Strawberries are pretty tough.

I have dragged my starwberries throiugh every kind of soil and size container and hardly ever got more than a handful of berries. Last year, I loved them to two tubs. The tubs are low oval black rubber type tubs made for watering farm ducks or something like that. They did so well, in fact that I loved them all into those containers. I bought them at Tractor Supply. We used a very heavy rich medium (organic hummus + screened top soil). I really thought the roots would smother but no. This year they have gone nuts. I will try to get a pic. So if your 5-1-1 mix doesn't work out, try this one. The tubs are literally covered in flowers and the leaves on the plants are much larger, too.