Final 6 trials

HEISHIN
10/9/2/1/1 MM/1 ATH (0 big dragons, 10 little): 45/86 (52%)
8/6/3/1/2 Mountain (2 big dragons, 6 little): 16/60 (27%)
8/6/2/1/2 Mountain/1 MM (2 big dragons, 6 little): 16/30 (53%)
10/8, 1 equip, 0 Umi, 1 MBD: 25/50 (50%)
8/7/3/3/1 Mountain/3 fields (2 big dragons, 6 little): 22/50 (44%)
14/13/4 equips (DT + 3 BC), 1 MM, 3 Umi, 1 WSR, 1 SK, 2 DM (14 big dragons): 13/15 (87%) -- done in Free Duel, no differences
15/9/3/3/2 MM/1 MBD (3 big dragons, 12 little): 87/100 (87%)
14/11, 5 equips (DT + 2 DE + 2 BC), 1 MM, 3 Umi, 1 WSR, 1 SK, 3 DM: 92/100 (92%) -- done in Free Duel with 2 losses counted as wins because 3500 DM got GG'd, 1 counted loss possibly being winnable on Yami field, and 3 duels ignored because of misplays (one of which was a ~50% loss)

So Megamorph almost doubles win rate... much more significant effect than on Nitemare.

SETO 3
10/8, 1 equip, 2 Umi: 5/35 (14%)
10/8, 2 equips, 3 Umi: 20/100 (20%) (lots of difficult execution, probably would be 2-4% higher with perfect play)
7/6, 1 equip, 1 Umi, 1 MBD: 13/50 (26%)
10/8, 2 equips, 3 Umi, 3 WSR: 15/50 (35%)
https://pastebin.com/uCs1g3Mx
13/8, plant/stone, 2 equips, 1 MM, 3 Umi, 2 WSR, 2 DCJ: 8/15 (53%) (probably would have won 9/15 with perfect execution)
14/12, 4 equips, 1 MM, 2 Umi, 1 WSR, 2 DCJ, 1 SK, 2 DM: 29/50 (58%) (probably 30/50 with perfect execution)
13/11 (8 big dragons), 3 BC, 3 WSR, 3 MBD, 1 DCJ, 1 SK, 1 DM, Dark Hole: 10/15 (67%)
16/11 (13 big dragons), 2 equips, 2 MM, 1 WSR, 1 DM, 3 DCJ: 9/12 (75%)
12/12 (11 big dragons), 4 equips (BF + 3 BC), 1 MM, 1 MBD, 1 WSR, 3 DCJ, 1 SK, 1 Zoa, 2 DM: 19/25 (76%)
18/15, 2 equips, 2 MM, 2 WSR, 3 MBD, 1 SK, 1 DM, 3 DCJ: 42/50 (84%)
14/10 (7 big dragons), 2 equips (DT + DT), 3 MM, 3 WSR, 2 MBD, 3 DCJ: 17/20 (85%)
11/10 (10 big dragons), 1 BC, 3 MM, 2 MBD, 1 SK, 3 DM, 3 Gaia, 3 Curse, 1 WSR, 1 CC: 44/50 (88%) (possibly 45/50 with perfect play)
13/12 (13 big dragons), 3 BC, 2 MM, 1 WSR, 3 DCJ, 2 MBD, DH: 11/11 (100%)

BEUD is basically impossible to beat with just Raigeki  :(

DARKNITE
6/5, 3 equips, 1 Umi: 20/31 (65%)
16/11 (13 big dragons), 2 equips, 2 MM, 1 WSR, 1 DM, 3 DCJ: 14/15 (93%)
11/10 (10 big dragons), 1 BC, 3 MM, 2 MBD, 1 SK, 3 DM, 3 Gaia, 3 Curse, 1 WSR, 1 CC: 25/25 (100%)
13/12, 5 equips, 2 MM, 1 Umi, 3 WSR, 1 MBD, 2 DCJ: 50/50 (100%)

NITEMARE
6/5, 2 equips, 1 Umi: 12/50 (24%)
6/5, water/spellcaster, 2 equips, 3 Umi, 2 WSR: 18/50 (36%)
10/8, water/spellcaster, 2 equips, 3 Umi, 2 WSR: 19/50 (38%)
10/8, plant/stone, 1 equip, 1 MM, 1 Umi: 19/50 (38%)
18/12, 3 equips, 1 Mountain, 1 WSR: 18/50 (38%)
10/8, plant/stone, 2 equips, 3 Umi, 2 WSR: 20/50 (40%)
10/8, plant/stone, 1 equip, 1 MM, 3 Umi, 2 WSR: 24/50 (48%)
10/8, plant/stone, 3 equips, 1 MM, 3 Umi, 2 WSR: 50/94 (53%)
13/8, plant/stone, 2 equips, 1 MM, 3 Umi, 2 WSR, 2 DCJ: 53/100 (53%)
9/9 (1 TD), 1 equip, 1 MM, 2 Umi, 1 MBD, 1 WSR: 31/50 (62%)
15/12 (7 big dragons, 2 Kaminari Attack), 3 equips, 1 MM, 3 Umi, 3 WSR, 3 DCJ: 35/50 (70%) (some difficult execution)
16/11 (13 big dragons), 2 equips, 2 MM, 1 WSR, 1 DM, 3 DCJ: 37/50 (74%)
15/11 (12 big dragons, 3 Kaminari Attack), 2 equips (DT + HoL), 3 MM, 1 Umi, 2 WSR, 3 DCJ, 1 SK, 1 Zoa: 38/50 (76%)
13/12 (10 big dragons, 1 Thunder Dragon), 3 equips (all BC), 2 MM, 1 Umi, 1 WSR, 1 DCJ, 2 SK, 2 Zoa, 2 DM: 38/50 (76%) (35/50 w/ 3 Yami + 1 Black Pendant strats)
12/12 (11 big dragons), 4 equips (BF + 3 BC), 1 MM, 1 MBD, 1 WSR, 3 DCJ, 1 SK, 1 Zoa, 2 DM: 39/50 (78%)
15/12 (11 big dragons), 4 equips (3 DT + 1 BC), 2 MM, 1 DCJ, 3 SK: 39/50 (78%)
13/11 (11 big dragons), 4 equips (2 DT + 2 BC), 1 MM, 3 WSR, 2 DCJ, 1 MBD, 1 SK: 21/25 (80%)
18/15, 2 equips, 2 MM, 2 WSR, 3 DCJ, 3 MBD, 1 SK, 1 DM: 43/50 (86%) (seemed a little unlucky?)
11/11 (9 big dragons), 1 equip (BC), 3 MM, 3 WSR, 1 DCJ, 1 MBD, 1 SK, 3 Zoa, 2 DM, 1 Yami, 1 Umi: 44/50 (88%)
14/12 (14 big dragons), 4 equips, 1 MM, 3 Umi, 1 WSR, 2 DCJ, 1 SK, 2 DM: 14/15 (93%) (seemed very lucky)