No problem, glad that you are on your way.
As mentioned, I haven´t paired my dimmer yet, so I cannot comment on that, but I had some wall plugs and I found that the best way was to reset them after excluding them from the Vera. Then they paired immediately. I am not sure it is a fault of the HE, but rather some quirk in Fibaro.
What I have seen is that many of the Fibaro devices use a Z-Wave command class called Crc16Enacp which is currently not supported in HE (will be supported later). Perhaps this is used also while pairing the dimmers ? Not sure though, as I have been able to get all other Fibaro devices paired fine.
I searched for the Fibaro manual and I would suggest to factory reset the dimmers and then trying to pair them. This is from the manual for the Dimmer 2:
Link here: https://manuals.fibaro.com/content/manuals/en/FGD-212/FGD-212-EN-T-v1.3.pdf
