Design Fault Perhaps
I decided to strip down my T500 column to see if there is something I can improve, in doing so I found a design feature that could be effecting the refluxing.
There is a space, 3mm wide running all the way up from the water outlet to the top black cap between the copper pipe and the wall of the column, it is too narrow to be filled with sadles so therefore vapour must pass the packing, some will be cooled and return downwards, but there must be a percentage that gets past, IMHO, it could also cause a surge up this space if the packing is too tight.

I am going to wrap the pipe with SS scrubber that I pulled into a long strip before refitting it to see if this improves
There is a space, 3mm wide running all the way up from the water outlet to the top black cap between the copper pipe and the wall of the column, it is too narrow to be filled with sadles so therefore vapour must pass the packing, some will be cooled and return downwards, but there must be a percentage that gets past, IMHO, it could also cause a surge up this space if the packing is too tight.
I am going to wrap the pipe with SS scrubber that I pulled into a long strip before refitting it to see if this improves

