If your entire cycle took 9 days than that is why you are not having the same issues. Did you use seeded media or a bacterial supplement?I've just completed my fishless cycle in 9 days total..even though my nitrites were off the charts between days 7&9 it began to show signs of change before completely bottoming the morning of day 9...I stand by the process passed on to me by not interfering in the cycle(pwc's)&continue dosing ammo until nitrites drop out..To me it's about consistency&patience..good look&hope your cycle completes sooner than later..
When your cycle takes 30-60 days different thing happen that can cause problems. I am not saying they always happen, but they do happen. Primarily the issues are too much ammonia or nitrite stalling the cycle or pH crashing from building massive bio-filters.