@Arminkh
Sa'ar 5 corvettes (pic below) displace less than 1300 tons full load, yet they carry 16 Barak-8 SAMs in VLS cells, and 8 Harpoon missiles. It only has a slightly wider beam and deeper draft, but is about 10-15 metres shorter.
Iranian ship designers need to get a bit more creative IMHO. The Sahand has been speculated to be in the 2,000-2,500 ton range. It is visibly bigger from satellite pictures than the 1500 ton Jamaran.
Move the gun further forward. The VLS does not need to be flush with the deck. I'm aware that the Sayyad-2 type missile is larger than the Barak-8, but surely it is possible to fit it. And one or two CIWS.