Buddy that's not how a whale fire grid works, you just focused completely on the Ascalon's assault and dropped Exceed and Defender. Whales vary usage between 3 ascalons, 3 UE swords, phantom sword, 2 nemeas and 3 Mars depending on how much HP/Vigor they need for the battles. And if you are wondering about the UE Swords, fire has to wait a long ass time compared to the other elements to nab the second Exceed weapon (I believe one is coming to nutaku soon) some space whales decided to keep it as 2 1-star copies and brick it
For the more down to the earth - F2P friendly version, assuming you are a vet and you have 1 shingen lance - 2 Typhon spears (Again 1 more incoming on nutaku) - 1 Vlad lance - 1 Mars spear from sheer luck and if not you can opt in for the Iwanaga SR spears to compensate for the lack of Exceed on Fire
And even if you miss out most of these events you can just farm for the SR disaster spears, once you get stronger you could consider buying vlad lances with oris(not sure how i feel about this option) and still use a budget spear grid and it would still be a decent grid that gets you through normal content
EDIT: Since the whale grid part's wording might be completely fucked i will just clarify it. It should go like 3 UE Swords, 1~2 Nemea Hammer OR Mars Spears and the rest Ascalon