If they are OK with the height you have them at now just keep it how it is and lift the light as they stretch. I keep them on grow nutes until they stop stretching (about day 35 depending on strain) and also on 24/0 light during the stretch so they don't bolt when the light goes off. It works well for me with my box only being 1.4m high.
This is day 73 for this Little Dwarf. She's 26" from the soil, sorry about the crap pic.
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Day 24 for this GSC. I think the clawing is from having her too close to a fan.
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