quite unlucky? I see a camilla + Lyla and I cannot see how you're unlucky with your premium summons.

First thing first, CC bashira (get her to 50CC40 or 50CC50, 100% aff) because she'll be your primary archer.
Next, get the following units to 50CC40 with 100% aff: Cloris, Iris, Bernice, Alissa, Katie if she isn't 100% aff yet, Valerie, Calliope, Soma.

Once the above are done, Get Camilla and Lyla to lvl 50 and prepare to CC when possible. Camilla > Lyla in priority.

At this point, you should have this core team: (copied from lafate class army guide)
2-3: Duelist (Kerry/Lyla)
2-3: Healers (Camilla, Iris, Alissa)
2: AoE Rear (Pallis, Valerie)
2: Physical Rear (Bashira, Soma/Daniela)
2: Magical Rear (Cloris, Calliope)
2: Tanks (Bernice, Leeanne)
2: Soldiers (Katie, Phyllis)
2: Anti-Zerg (mincosted bronze soldiers)

level whatever at this point while focusing on getting core team to max level (50CC50 for the plats, max for the golds and silvers). Suitable subs/replacements to level include: Julian (replace phyllis), Cypria/Betty (assassinator), Fedora (as 4th healer), Conrad (never have enough duelists/hp soak) then finally Stella. (I personally got my cypria to lvl 40+ for cheap assassinator/deployment, kept phyllis at lvl 40+ pre-CC since she's just emergency UP generator, no need for CC)

I'd suggest throwing some SCs into Phalanx 2 runs to generate the aff items needed (fairies can be used to level up golds to 46/54 before feeding them exp armor to 60, and plats from 50-70)
Levels to use exp armor at: http://millenniumwaraigis.wikia.com/...it_Combination