Hmm so just came across this (within this thread it eludes to some of the problems with the eibach on standard dampers) 
. Niseko1 is your car on sport or standard dampers?
Basically it seems the eibach springs on the standard dampers = not great, but the eibach on sport dampers does work well.
It basically leaves me with replacing the front springs with KYB or sachs, or going the full way and replacing both dampers and springs. Given it’s low usage, it doesn’t make sense to me at the moment to go the latter and I will just keep it standard.