So...yo only have a 800 cu/ft room, 28000 btu of cooling, but only a 11 degree drop. All hoses are plumbed outside, with 2 hoses blowing hot air and one sucking air, with only the AC units themselves inside the room blowing cold air. I can't think of any obvious problems. If you turned off the LG unit (the one with 1 hose), does it affect the temp in the room? Since it pulls some air out of the room to cool the AC unit since it only has an exhaust hose, it could be pulling cool air with it. I would try using just the Ideal system for a few minutes and see if you notice any difference. I guess you could try it the other way as well, just to eliminate variables. This is a head scratcher.