What I did was kill them at the start since there's no real risk and go in hard as much as possible. Even when he starts his teleport you can get a hit in. When it changes and he starts attacking I ignored the spiders and would purely do hit and run. Don't go in and charge attacks/be greedy, just go in for a swipe and get out. The spiders might start to bunch near him so I would then run around to try and pull them away. While I didn't go out of my way to kill them I would hit some if their back was facing me since they're really squishy and it clears the area a little bit.
Beyond all else if you see him raise the tail run far away since the shockwave does huge damage.
Beyond all else if you see him raise the tail run far away since the shockwave does huge damage.
