Wedding Cake Slowly growing!!! Please help!!

Don't peel off the rapid rooter, that shouldn't be the cause of your issue and will damage the roots of the seedling. Sometimes seedlings fail to thrive due to genetics, and that could be a a possible cause of the slow and twisted growth. But I would rule out environmental causes. Some possibilities: Were you first growing the seedling in the rapid rooter outside of the soil (soiless)? If so the 6.5ph could have been too high and caused lockout or stunting before being planted into the soil for example (the ph for growing in only a rapid rooter should top out at 6.2-6.3). The EC of 1.2 if accurate also seems high for a young plant growing in soil which already has nutrients. Too high EC can hurt the roots and prevent proper leaf transpiration. Hope that helps! 👍