You are gonna have some problems with durumu and dark animus. For some odd reason it's HARD not to move with blue beam for some people or wrong wall goes down.
@OP If you have problem with same guy every ionization, why not have him stand outside the pool? It's not like enrage is problem on this fight anyway. I still wouldn't say it too unforgiving to give players 30 secs to move out of pool. Dispelling shouldn't be too hard either as long as they only dispel people who called it. Most annoying part about ionization is, when boss dies and people have the debuff on pool, it expires and kills everybody that's standing on the pool.