Lennox xc 25 not dehumidifying

[Gators614]

Hi
I have three ac units in my house all Lennox xc 25 two of the units are working fine humidity is about 44 +/- the third unit which is only in the bedrooms is running humidity in the 60-65 range and then finally getting down to 56-58. This unit has a damper system but all three zones are within 1-2 degrees of humidity. The following are the pressure readings

Low side- 128
High side - 290
Super heat - 17
Subcool- 5

All units use the I comfort thermostat and are set to 40% humidity. Any help would be much appreciated. Thanks

[mofotech]

try changing your filters and washing your outdoor units...

[beenthere]

Sounds like it may simply be over sized.

[pierre1811]

Try slowing the blower speed so the air going across the indoor coil isn't moving too fast to condense