If you died in 65 shard with this warlord build then it was for sure some piloting mistake. I guess you were debuffed by Grava’thul and then hit by Alex’s meteor and managed your cooldowns wrong. I was testing this build for spanky in high shard and pushed it to 98 shard (with cosmetic changes for my gameplay) and then passed 100 with another change strictly for sr. 65 shouldn’t be a problem, no matter what boss combo for build like that and agroabuse doesn’t matter - this setup can kill 1vs4 all bosses up to 80 without trouble if you don’t do some crucial mistake.
If you want some builds able to handle all possible boss combos without agroabuse in range 65-75 then:
Retaliation warlord, I could facetank all bosses in sr100 (glitchless) and even 119 (with some glitch spot but still even 1 boss were hitting harder there than whole worst possible existing combo in 75).
Dark one ritualist/conjurer specialized in meele side in half. They are harder to play vs bosses like Moosilauke because of poor freeze resistances but if played corectly you shouldnt die too.
Primal spirit/Bysmiel conjurer - this version has so high CC resistances that you can fight whole boss room in 65-75 farming range too.
Some low-one target but good aoe lightning sorcerer - I’ve passed sr 96 with Kaisan and no agroabuse with it, in 65 you will not die even nullified by Grava, health regen is too high.
Forcewave warlord, must be played carefuly sometimes but shouldn’t die too.
Battlemage, sometimes must be played carefully vs worst combos but Mirror will save you if timed good
Sorcerer using Lokarr set as bonus, you can see video with sr 80 where I’ve passed it deathless vs Grava’thul, Madqueen and Valdaraan.
Some of these builds could need some update (I don’t play much currently so maybe in future) but still works good, in comments there are some improvment versions.
There are just few builds specialized directly for sr, forum got a lot of great ones too made by other authors with videos.
If you want glasscannon specs then sometimes you will not handle all bosses at once and agroabuse may be needed.