Battleship encounter?

[o0genesis0o]

[zone]
nickname = Zone_Li01_001_Planet_Li01_01
pos = -33020, 0, -27925
rotate = 0, 104, 0
shape = SPHERE
size = 7000
comment = Manhattan
sort = 1
toughness = 1
density = 15
repop_time = 10
max_battle_size = 8
pop_type = li_p_grp, base_cluster_law
relief_time = 10
faction_weight = li_p_grp, 12
faction_weight = li_n_grp, 10
faction_weight = co_be_grp, 10
faction_weight = co_hsp_grp, 10
faction_weight = co_kt_grp, 10
faction_weight = co_me_grp, 10
faction_weight = co_nws_grp, 10
faction_weight = co_ni_grp, 10
faction_weight = co_os_grp, 4
faction_weight = co_rs_grp, 10
faction_weight = co_shi_grp, 10
faction_weight = co_ss_grp, 10
faction_weight = co_vr_grp, 8
faction_weight = gd_bh_grp, 3
faction_weight = fc_freelancer, 4
density_restriction = 4, unlawfuls
encounter = area_defend, 1, 0.000000
faction = li_p_grp, 1.000000
encounter = area_bh_defend, 1, 0.000000
faction = gd_bh_grp, 1.000000
encounter = area_armored_prisoner, 1, 0.000000
faction = li_p_grp, 1.000000
encounter = area_trade_freighter, 1, 0.000000
faction = co_hsp_grp, 0.260000
faction = co_me_grp, 0.260000
faction = co_ss_grp, 0.260000
faction = co_vr_grp, 0.210000
encounter = area_trade_transport, 1, 0.000000
faction = co_be_grp, 0.100000
faction = co_hsp_grp, 0.100000
faction = co_kt_grp, 0.100000
faction = co_me_grp, 0.100000
faction = co_nws_grp, 0.100000
faction = co_ni_grp, 0.100000
faction = co_rs_grp, 0.100000
faction = co_shi_grp, 0.100000
faction = co_ss_grp, 0.100000
faction = co_vr_grp, 0.080000
encounter = area_trade_armored, 1, 0.000000
faction = co_os_grp, 1.000000
encounter = area_lifter, 1, 0.000000
faction = co_me_grp, 0.500000
faction = co_ss_grp, 0.500000
encounter = area_repair, 1, 0.000000
faction = co_me_grp, 0.500000
faction = co_ss_grp, 0.500000
encounter = capitalships_Liberty, 19, 0.250000
faction = li_n_grp, 1.000000
encounter = capitalships_Liberty, 19, 0.250000
faction = li_n_grp, 1.000000
encounter = capitalships_Liberty, 19, 0.250000
faction = li_n_grp, 1.000000
encounter = capitalships_Liberty, 19, 0.250000
faction = li_n_grp, 1.000000
encounter = lone_freelancer, 15, 0.000000
faction = fc_freelancer, 1.000000


that the code after i change some number about capitalships_liberty. All civilian ships don't appear but there's still no big liberty ships:(Since i install the discovery (before i change any number) i've never seen any cruisers or battleships in the space of new york:(please do you have any more suggestions?