How to make your Gwd2 boss kills even faster?

My records atm for all gwd2 bosses are between 54 to 57 seconds. What are some little dps boosts that help that one might forget to use? Something relatively inexpensive. Likewise for Magister too, any tips to make that go quicker would be great. Hoping for 40-45 second gwd2 kills if possible ??

Here is a little background with what I'm using atm

I use Vuln bombs @ magister but not gwd2 I cant justify it there. Aug t80 armour @ both. Asc crossbows I use for magisters with ruby bak. And I use dual wield t90 for helwyr, t90 staff for vinny, scythe for furies and asc crossbows at Greg with dstone bak. I'm using cinderbanes and weapon poison where applicable and if not I use death touch bracelet. I use AOS at gwd2 and reaper neck @ magister.

Really appreciate any feedback guys! Hope y'all had a great weekend.