AK49 auto not flowering

As per the title. It's been 9 weeks since the germinated seed went into the pot. I have been growing it under Mars Hydro T1000 18/6.
Seed City said on the website it should flower at ± 56 Days. No signs of pistils right now. It could be from mites problem from 1 week earlier causing it stress, but I've taken care of the mites.
The Question is should I got no light for 2 days and switch my light schedule to 12/12? and after I switched should I keep it 12/12 and not switch back to 18/6?

I'd just flip the light to 12/12. If after a couple of weeks you have signs of flowering then leave it on 12/12. It sounds to me like you have a batch of photos, not autos.