Assuming the break fee is correct (I'll get to that later), it's obviously not worth your while breaking.
You've 111 months remaining term, with 99 months fixed at 2.99%.
Even if you could refix at 2.3% the interest savings are only 5,900
The break fee itself I've struggled to match exactly. I've calculated 11,600 but I might just have the wrong dates. Using the rates they provided it works.
I apologise if the following gets technical. The break fee is calculated on your current balance. I performed a separate calculation based on the reducing balance of your mortgage. For example you only fixed 21k for the full 10 years because that's all that would be there. Another 18k for 9 years, 17k for 8 years, etc.
KBC T&C's don't allow for this (actually AIB is the only bank that does), but we could get into a technical argument about EU directive with them if it was worthwhile. But even allowing for that, the break fee would still be over 6k, so still in excess of your savings.
You shouldn't regret fixing. You can take great comfort from knowing exactly how much your mortgage will cost until it's less than an average car loan.
If interbank rates start to track upwards, and mortgage rates stay competitive, it might be worth looking at again, but for the moment it's not.