In reply to Cuillin Calling:
Sounds like the boots are a little to big for you volume wise - and your mitigating this by cinching them super tight with the laces, leading to folds in the tongue material (i.e. the soft bit) which is then rubbing and giving you discomfort. It's been suggested above, but a volume reducer is probably the way to go here.
Could also be worth taking the laces out of the tab, so they are free to find their own position on the boot, rather than bunching them together causing pressure in what looks like a flex point.
Post edited at 11:36