SPP in extended T500 column

[Fusto]

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Hi all,
I am hoping that there is a chance I could please pick your brains?
Hopefully this has not already been covered in another post, but if it was I could not find it.

I have SPP supplied locally by KegLand (3.4mm or 0.13"). I purchased a few bags of them (500g or 17.6 oz), as well as the extension tube for my T500 reflux column (24cm or 9.5" long) from them (Previously I added tri-clamp adapters and a 2" sight glass).
I have been testing the difference with the Still Spirits steel packing (Comes with the column) compared to SPP. The default packing was fine, but when I changed to the SPP the column flooded and reflux stopped.
The temp would fly all over the place, reflux would stop and nothing would come out. Then the temp would skyrocket (Over 80°C) and the distillate would 'spew' out with force (hot and around 70% ABV whereas normally I get over 93% ABV).
This would repeat over and over.
Any assistance that anyone can offer with this would be greatly appreciated.

Just FYI:
I used the Grainfather boiler, so I tried it both a 65% and 100% power, same result.
I also tried both shaking the column to add more SPP and not shaking at all with a loose pack.
At the boiler end of the column I have wire mesh with silicon gasket holding the SPP in place (Mesh is loose enough that it holds the SPP in but that is all).
I am in Australia so the boiler is the 220V version.

Many thanks all!