My Adolescents - time to repot?

After more than a few disasters there are finally some successes.
 
Would appreciate advice on is this the right time to repot, and if so what is the ideal pot size.
 
Should there be just one plant in each pot?
 
I have read several posts on the effects of direct sun on plants. I am fortunate to have balconies that get some morning sun, and others that get the late afternoon. The temp in direct sun will not fall below around 33/35 degrees. Is this too hot for plants at this stage? I have managed to kill the last batch with excess sun, so these plants have been in the shade.
 
Again, many thanks for any advice
 
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