The drydown effect is caused because fibre prints shrink as they dry. This contraction of the gelatine causes the increase in contrast. Therefore taping stops the shrinkage, and the drydown.
If the image size / paper size is measured before, and after drying, the shrinkage will be evident. Because the taped print is not allowed to shrink itís final trimmed size will be very close to the traditionally dried print.
Taping on only two sides will result in the print adopting an hourglass shape, interesting but unlikely to set a trend.
The slower a print is dried in the conventional way the flatter it will be. Clipping two prints back to back whilst they dry is another well tried method of flattening, but doesnít get over the drydown problem.