I have the same problem in first week after relocation. I use Canna Aqua A+B, too.
First I lower the Ph range to 5.7-6.0. Above 6.0 I read that are some elements that are not absorbed by roots. Maybe that is what your plants are missing.
Second I riseed the Ec from 1.1 (witch was the initial value) to 1.5.
If humidity is lower than 50% try to sprey the leafes with carbonated water. It could be also lack of CO2. I also use CO2 tabs (I don't have money for a CO2 system, yet)

It works for me and my plants!