Don't sweat it. You are doing pretty doggon good for only starting in May. An Imperial team is a good counter to the NS. If i recall correctly: Gen Veers, Vader, Imp TP, and Imp Stormtrooper. or EP lead with Vader, GAT, GMT, and GV. A strong Bounty Hunter team would do the trick to control the NS turnmeter. For instance an IG-88 Lead with Boba, Cad, Greedo, and Zam. (all those teams shoukd be easily accessable at your level. Phoenix unlocks GAT, and EP)). I would highly recommend you start farming Bastilla, Jolee,T3, mission, and Zalbaar (the key to JKR). Then when they are geared good (g9-11 with zeta on jolee and bastilla), plug bastilla and jolee with Ezra and Kannan and Gmy with Bastilla lead. You will have an easier time vs the NS. Another team i have used against the NS with success: EP lead, Vader, BS Fallen, Sidius, and either sion or nihilus in support.