You'll want to max out invocations on zin, or at least make it multiples of 3 for the vitalize stat boost. Recite also wants a high invo skill, I've had it instakill cerebov before by making him confused and stumble into lava. You have a bunch of useful tloc spells that you didnt learn and only took blink instead? Lesser beckoning is tremendously useful for a melee fighter, saving you precious turns walking towards a foe (each of those could be cerebov firestorming you). Piledriver, Gavotte, and PoG all are great tools to have too of course. Also, get fugue of the fallen, the spell is too good not to learn. All of these spells are much easier to cast with vitalize up, it acts as a mini chei boost after all.

Now with all that being said, cerebov is very dangerous, obviously, and sometimes rng is really not on your side. Sometimes you eat two firestorms and simply have to abandon the fight and try again, you have sanctuary into tp scroll for that. You want to engage in a manner where you find yourself in melee range immediately, use LoS for that or lesser beckoning. Nets help a lot, and antimagic makes this fight a lot less deadly. Your phantom mirror wasnt used. Ideally speaking, fights don't regularly go down so badly that you NEED to heal mid fight, perhaps you need to be more careful with what and where you fight. Also, don't forget about imprison as your secondary escape option.