I'm afraid I haven't planned enough walking per day. Any suggestions on detours/things to see?

I've planned 4 days of hiking according to the WHW guidebook, starting from Tyndrum. But my partner and I are quite fit and 15 km per day seems not enough to occupy us for an entire day.

Do you have any suggestions on things to see/visit, detours to make for the first 3 days?

- Day 1 : Tyndrum to Inveroran (14.5 km)

- Day 2 : Inveroran to Kingshouse (16 km)

- Day 3 : Kingshouse to Kinlochleven (14.5 km)

(Day 4 is okay with 24 km)

Thanks for your help!