these are some useful SR that left in me depending on your troop class you can add some.
1 shibata katsi (residence)
1 naoe kanetsugu (baracks)
ichido kanesada (25% attack on every unit less than enemy)
kakizaki kageie (20% speed and attack / 30% lifesteal when hp is below 50% best SR imo you can use its lifesteal to progress later when you face reflect enemies)
naoe kagetsuna (early to mid game tank good sustain)
katakura koujoro (0.5% damage reduction per level / 15% attack and defense good early to mid game tank)
mori terumoto (strong reflect)
hoganji keenyo (good sustain for tanks/ voodoo)
usami sadamitsu (reduces other team defense)
konishi yokinaga (taking aoe damage 80% to avoid death) will be useful sometimes I think.
amago tsunehasa (cheap 15% lifesteal)