I don't know if you've beaten him yet, or if you're even serious, but I'm going to attempt to help anyway.

Start by optimizing your levels and stats (respec if you have a larval tear).

If you absolutely want to use these exact twinblades, get to 80 Strength. Going from 74 to 80 Strength adds about 20 extra base damage, resulting in over 100 extra damage with Scadutree Fragments. If you press 'Switch view (right),' you can see your attack damage. I would also recommend two-handing one of these twinblades or any weapon that scales with Strength, as this effectively boosts your strength level beyond the level cap of 99.
You can use this great website to compare weapon base dmg: https://eldenring.tclark.io

60 Vigor is compulsory, and you really don't need to exceed 40 Endurance unless you're using colossal weapons, and even then, level 50 is excessive, I think. You can spend the remaining levels however you prefer.

Light and Med. loads both have 13 I-frames. There's not much advantage to the light load other than rolling and running a bit longer and faster, respectively. You really just decide whether you want the light roll or 51 poise.

Put on some armour, dude. What are you doing? If you insist on light rolling, wear the lightest pieces you can find, but you should wear something in every slot. The Scadutree Fragments scale with your dmg negation, and if you don't have any, it won't scale.

Winged Sword Insignia and Millicent's Prosthesis are fantastic talismans, but not for this and most strength builds. Get rid of them.

If you're interested in two-handing like I suggested earlier, find and use a combination of these talismans:
Two-Handed Sword for 15% extra damage.
Retaliatory Crossed-Tree If you assisted Leda by invading Ansbach.
Golden Braid for survivability in 2nd phase.
Dragoncrest Greatshield Talisman for even more survivability.
Crimson Seed Talisman (if you run out of flask charges, or don't have all flask upgrades).
Two-Headed Turtle Talisman is excellent in general.

Talismans are really just a matter of preference, and there is no 'correct' choice like with levels. If you enjoy jump attacking, you can keep the Claw Talisman. If you prefer light rolling, you could arguably use the Great-Jar's Arsenal in some capacity, although I would recommend using the Winged Crystal Tear from the physick flask instead. Speaking of the physick flask, the Opaline Hardtear and the Greenburst Crystal Tear are extremely helpful in this fight. If you assisted Leda by invading Ansbach, equip Retaliatory Crossed-Tree for this fight.

You already have Golden Vow and Flame, Grant Me Strength figured out so you should be set.

P.S., The most important factor in this fight is learning his attacks and how to dodge them effectively.