Personally I would pay it off now, and save 1 years interest in the overpayment amount Vs waiting to possibly save 0.15% interest on the entire? You'll have a lower balance, and paying off 3k per month (plus any further overpayments) will reduce the benefit of that 0.15% quickly.
This is assuming there's no opportunity cost by not doing something else with the money.
If you are looking for a break fee, remember it will be 10% lower if you pay off the 10% first before breaking.
Without knowing details of when you fixed, your break fee will be a max of 3,120 after you pay off a lump sum. It might be less based on market rates approach.
You need to weigh up break cost now vs future interest saving from locking in at a lower rate, including looking at moving to another lender - switching to KBC for example the break fee would be covered by cashback, and the interest savings for the first year should cover the legal fees.