Healthy starter yet dough doesn't rise

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Hello 

I new here but baking sourdough for quite some time 

I have a new starter about 2 weeks old, it rises 2-3 time is original volume in abou 6-8 hours depending on the inoculation ratio 

Im Im adding it to the dough after an autolyse, kneading for 5 min rest 20 and adding the salt about 2.5%

It used to be ok but with the new starter the is not raising as it should and i dont know why

The temperature is about 23c /75 f

The starter is 50% Ap and 50% fresh milled hard wheat

It can take about two months before the starter reach its full potential. 
So two weeks is very young. 

I guess it needs to develop more yeast. 
It would help if you can keeping it a bit warmer in the first week(s). 

Just got it out of the fridge after 12 hours 

Didnt rise at all so given it a couple hours outside and it started to rise

I ll bake it in an hour i ll see how it goes