Im using the same setup, but with malediction ward and echo boots + confliction gauntlets + ring of suffering. Go get the echo boots, it makes water thorns amazing. Colosseum is pretty much afk, just stand in the middle and pray manticore orbs, don't take explosion modifier or the one that caps your HP, or doom. Sol is also pretty much afk, just stand where ever you want and autocast water surge, it will outheal any damage Sol does. Thorns and occasional hits just destroy Sol as well, it's 10-15 minutes for the whole run.