3 Weeks in the Balkans - Feedback on Itinerary

Hi! I'm looking for feedback on a 3 week Balkan itinerary (see below for the itinerary we've researched so far). This trip starts in early September.

I'm mainly looking for feedback or tips on the logistics and amount of time spent in each city, but any suggestions or alternatives are welcome.

I'm happy to answer any clarifying questions.

Thanks in advance!

Background

We're planning on using a mix of busses and private transfers (Dubrovnik to Kotor, and Kotor to Tirana for transfers, ferry from Saranda to Corfu and a short haul flight from Corfu to Athens where she has family). We're not planning on renting a car, but one of us can drive if necessary.

Itinerary

Day 1: Travel from US

Day 2: Sarajevo

Day 3: Sarajevo

Day 4: Sarajevo

Day 5: → Mostar

Day 6: Mostar

Day 7: → Dubrovnik

Day 8: Dubrovnik

Day 9: Dubrovnik

Day 10: → Kotor

Day 11: Kotor

Day 12: Kotor

Day 13: → Tirana

Day 14: Tirana

Day 15: Tirana

Day 16: → Saranda

Day 17: Saranda

Day 18: Saranda

Day 19: → Athens

Day 20: Athens

Day 21: Athens

Day 22: Travel to US