I did pretty much that exact same run a few weeks ago.
Valkirie helps a lot in the abyss especially the room with all those damned rippers and fire pillars.
Also those specter swords gave me a hard time, but I just used Buer
(I think?) where the fireballs surround you.I haven't played the game in a while and have forgotten many of the enemies names so bare with me.
In the room with the two white dragons and a couple malachi, those dragons almost always hit me, lil' bastards..just find a way to hit em easily, then valkirie the rest of the way.
The room with the pink guys (malacoda?) and a few black panthers is also a gay one..
I don't have advice for that room I just hate those guys..
Near the end with the tanjelly, Erinys and a lot of spikes, I just used either the bat soul to fly around em, or the golden axe to kill the jelly and wait for the stupid erinys thing to fly over my head.
Next room now, I did the Golden axe succubus glitch cause I don't even wanna get near that white dragon.
Annnnnd there ya go
Hope it helps...a little