Jack herrer are small

i have 8 plants total, 2 are jack herrer. I cannot for the life of me keep these things growing at the same rate as my other 3 strains. And the fact I’m doing a scrog it’s really slowing down my timeline to be able to flip. Any advice? Is this strain typically this short? They both came from the same mother plant so I also believe maybe it’s just in the genetics.

if you think thats small good luck when you flip in flower, sativas nutoriously stretch during flower

Yeah the jack will stretch quite abit in flower.. you should be good to go in filling that space..