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Hi! Simon,

I suggested a cap that is in series and not to ground. The cap c122 charging when the TX voltage came on was the issue.
It helps if there is a 1K resistor parallel to C107 to reference/path to ground for decreasing the carrier burst.
Check if the cut track is really cut or a bit of copper left is causing the issue.
I desoldered the center pin of the preset, lifted the preset's desoldered pin and added a leaded cap in series.

It decreases the burst but reduces it to an acceptable level.

The charge up current spike of the cap C122 has to route to ground but we don't want it to go through the mixer diode and
momentarily unbalance the mixer.

A pic of what you did might give us a clue! I am not in town or I would send you a pic of what I did.

Cheers
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Raj, vu2zap