I have used screens for the last 5-10 yrs and then flattened with a warm dry mount press until I started doing 16X20 which I found frilled on the edges when flattened with a dry moint press. I tried blotting tablets but found the interleaving paper wrinkled after the first use then left marks on my prints afterwards. So I am now using AnscoJohns methods of drying on a screen then pressing under blotter paper under weights. It takes more time but provides extremely flat prints at minimum risk of damage. I would shy away from a heating style dryer.