It did help, it’s nearly eliminated it altogether although it’s still there at high volume although nowhere near as pronounced. I like to listen at high volumes when the neighbour and Family are out so keen to get rid of it all together.Moving the system away from the sub is worth trying, and if that doesn't help just try it with the sub switched off. (I wouldn't realign the tonearm yet - work out if it's the sub first)
I could move the system even further away from the subs and put in the middle of the speakers. Only issue is that then it would be directly in front of a radiator. Would that be ok?