That would definitely be high long term. Personally, I would aim closer to 60%
How are you measuring the humidity? Digital hygrometer, stick on dial, humidity probe? Dials especially tend to be inaccurate. Here's how you can test it to see if it's accurate https://www.neptunecigar.com/tips/ho...our-hygrometer
The CHE should dry out the bedding reasonably quickly. If it were me I'd remove maybe a quarter of the bedding and Mix in dry mulch/eco/sphagnum and see where that takes the humidity?