"He who marches out of step hears another drum." ~ Ken Kesey
If you're using silly old-school tricks to keep it from sticking, just put another piece of poly in between the positive and emulsion. (Also works to trap the white on designs from sep impaired artists)
Fix your humidity problem and dont waste time on gimmicky work arounds that are band aids for the underlying problem. 55% is too much. Our screen room sits around 25% if not lower. The moisture issue can also be in the film if your humidity is high where your films are stored. They are made to attract moisture.