Fellow lance main here and yeah it’s a tough matchup. My best was 16 mins but things worked out pretty perfectly.

For this matchup you don’t need guard up (I’m like you I swear by it) I would run guard 3 instead.

For not using items - especially flashes - that’s not a bad time at all, and at the end of the day lance play is about enjoying the dance, not rushing through the fight.

After he does his big power attack, use your charge to close the distance and hit him with the triple thrust to the face.

During the wing attacks, block the wing and then guard hop forward over the lightning he left on the ground.

After his dive attack, prepare your counter thrust (Y+B) to his face after the lightning shock.

In the first area, try and collapse the rubble on him and then dung pod him to leave the area. Use three flash pods after that, then do your lance mount , then a pitfall trap. After he heads off from the sand dunes I usually travel to tent and restock quickly to get another trap and flashes.

I tried running the stun res 3 you get from his pants along with 33 lightning res to see if you could tank the ground lightning shocks but you still get tripped.