One of the frogs I haven't kept is Whites, but I have researched into their care thorougly and from what I've gathered I would suggest dropping the ambient down to 75-78F at day - 80F being your max, with a nighttime drop to 68F or at least 75F. Many recommend a basking area 85F to 90F.

50% humidity shpuld be fine most of the time, increased with a spraying several times each week is recommended. As long as it's not constantly above 60% there's no need to remove the waterfall.

Hope this helps until someone else comes along