Count again. There are The Defiant R, the MVAM/Prometheus, the Fleet Escort, the Bug Ship: 4 escorts.
The Luna class, the Trident class, the Nebula R, the D'Kyr Vulcan ship and the Intrepid R: 5 science ships total at T5.
Of course cruisers are ahead regardless: Sovereign, Starcruiser, Galaxy R, Galaxy X, Galor and now the Odyssey: 6