Hello all - so just to report back.
So I increased the VTF just shy of the full 2.2g and it did seem to improve with the last track 8 on side 2 of the HFN test LP. There is still some slight buzzing/distortion on the right channel, but it is less than it was - so I guess it did help after all and am now leaving it at this setting as I can only assume you need to run this cartridge at the max tracking weight for this tonearm setup.
What was interesting, is that I was able to pass tracks 1 and 4 on side to with the anti-skate set to about 1.5 but as soon as I got to the 8th track, I needed to move it up to the 2 mark or slightly beyond to reduce the buzzing.
Time to finally listen to vinyl and thanks again everyone...!