Based on experience as a tourist in Ecuador a few years ago and now as a resident of Ecuador, I think your itinerary might be a little aggressive - particularly the Bahia/Mompiche/Quito stretch.
Here are some driving times for your suggested itinerary:
Quito-Otavalo: 2 hours
Quito-Cuenca: around 8 hours
Cuenca Salinas: about 5 hours
Salinas-Pto Lopez: about 2 hours
Pto Lopez-Bahia: about 3 hours
Bahia-Mompiche: about 3 hours
Mompiche-Quito: I've never done this route directly, but I'll guess at 5 hours
So as you can see, you could be spending quite a bit of time in a car. Some people are comfortable with that while others get a little road weary.
On my first trip to Ecuador, I rented a car in Guayaquil. After two nights in Guayaquil, I drove to Bahia and spent a night there. From there I drove to Puerto Cayo and spent the night. From there to Pto Lopez for three nights. One night in Montanita. Drove from Montanita to Machala and one night in Machala. Machala to Cuenca for four nights before heading back to Guayaquil.
I made the mistake of setting my itinerary on the distance between the cities, not taking into account that driving in Ecuador is very different from North America. Ecuador has good highways, but the terrain often dictates that your speed is under 40 mph.
Please feel free to send me a private message if you would like to take the discussion offline. I currently live in Manta, but I am relocating to Banos in the next couple of days.