Lol I know it in first glance why you got bad hands, and ofc it'll make it harder since you are in Platinum 1-2, and it'll became a nightmare at plat3 since u need to win 5 consecutive win. Here's my opinion:
(its long, pls do not tl;dr)
1] Make it 20 cards (throw overwhelm and pot of dictotomy/shard of greed), you dont need overwhelm since you depend on big wave small wave too much. ORRR 2] you can throw 2 shard of greed, pot, and enemy controller away, add 1 more overwhelm and 1 more Sea Amulet
3] Why Bubonic Vermin? it doesnt work with Big Wave Small Wave? what are you try to achieve? decreasing deck?? Use Skelengel instead ORRRRR 4] You can swap Bubonic with Needle Sunfish/Yomi Ship/Piercing Moray, up to you.
5] Change 1 Suijin to 1 more Daedalus, 6] 4 starred ladybug of doom change it with Yomi Ship, 7] Do you have Kaiser Seahorse? Try to add it but keep the deck 20, its nice you know, its hard hitter
So the real problem here, your deck consist a balance amount of Monster and Spell, but it doesnt synchronize each other, your monster is too much waste of deck cause it dont do much work, and your spell is not that fatal to enemy cause it doesnt sync well with your monster. So most of the time you'll hard to find the right card to play in any given situation since its not synced each other
So you need to press your deck to 20 and swap those unsynced card. If you dont mind you cand post it again and tag me so I can see your new deck. In case you dont trust me I'm in KoG, yeah just saying.
Seriously tho, dom doesnt have many bad suggestions. Going more daed will give you higher reliability because suijin relys on your opponents mistakes rather than your positioning. Overall Id try to take this over to a more daed focused deck and to do that you would drop sheep and vermin and add things like kaiser seahorse and hydras in their place. Overwhelms and amulet could be replaced.