Help with Itinerary please. Considering:

Leaving your itinerary as is, I would take a night from Trogir and add to Rovinj and 2 nights from Zadar and add to Zagreb.
The reason being that there is much more to see in Istria such as day trips to Poreč, Pula, or Grožnjan.
Zagreb has much to offer and day trips from there also, such as Plitvice Lakes. (Don’t go from Zadar). Or stay one night in Plitvice, many posters do and they have a better visit.

Changing durations may help with your Venice visit so it is not over a weekend.

Also, is there a specific reason for staying in Trogir? Beach, relaxing time? Because it is perfect as a day trip from Split. Very small town. I travel slow but have never stayed over in Trogir.

I’ll let others answer then chime in again.

I went in 2023 and loved it SO much. We did Split, Vis, Hvar, Brac and Dubrovnik. Personally i think Split was just ok - we were there 2 days and that was more than plenty. Our favorite place was Vis - small town, not super touristy and we rented a boat there. Hvar is pretty but SUPER touristy. Brac was beautiful as well - we didnt spend much time there but wish we did. We went to a family winery which was so fun.

Thanks for your reply. I have removed Venice and Trogir from our trip. We may rent a car from Rovinj to drive into Slovenia and will drive to Zagreb on the way back and fly home from there. May I ask why not to visit Plitvice from Zadar? It would be a day trip excursion for us.
Thank you.

Much like Barbara, I might suggest:

Dubrovnik 5 nights
Mostar 1 night
Korcula 3 nights
Split 4 nights if you do the Blue Lagoon day trip and take a day to visit Trogir from Split
Zadar 3 nights if you go to Krka one day from there
Plitvice stay 1 night
Rovinj 4 nights
Slovenia as many nights as you have left (it’s not a bad drive from Rovinj to Ljubljana but I spent a night near Lipica for the horses first)
Zagreb 3 nights to return car and be there for your flight. Caveat: Zagreb is the one place on your list I haven’t been.