Well I’ve never stopped adding ice bottles. I added a 1 L ice bottle yesterday. Went about 12 hours without a bottle change and the temp was right at 77.5 added a 1 L and 2 16 oz. Bottles 8 hours ago and the temp is at 72.5. I suppose the extra water is helpingSo adding more water volume didn't help?
That pump will come in handy trust me.