65% should not be a problem.
The standard computer room humidity is 45 to 85% but the important issue is the rate of change in Temperature.
High Humidity is only a problem when the temperature drops suddenly, if the temp is high with a high humidity and the temp drops rapidly the moisture can drop out causing moisture corrosion on terminals and hardware.
But in my 25+ year experance I have yet to see it occur in a correctly design and operated data centre. I have seen it occur in a server room where the A/C was too large for the load and space and the unit controls were faulty.
The Humidity rating quoted by a supply is the normal operation range to try and stop both moisture drop out with high humidity and static electricity problems with low humidity.
In temperate climates a lot of data centres turn of the humidification and heating to save energy as 99% of the time the extremes of the humidity are not reached.