Well currently with the Bozja relics at this point in time due to the general lack of players actively doing DR normal, I'd really just suggest clipping a good chunk of the HP off the bosses to make the fights noticeably shorter with 1-3 ppl and also making that DPS check phase a bit easier to complete when lacking ppl, while also increasing the amount of timeworn artifacts awarded for finishing it. Honestly I feel like this is all the tuning the process needs as no longer current content.