<p>I do not have a problem with scratches in tray development. First, I only develop two sheets at a time. After all, I went to a lot of trouble to capture the image. A little more time developing it is just part of the deal. Second, I do not shuffle constantly. Three inversions for each sheet at one-minute intervals provides enough agitation, allows the developer to work in peace and exposes the surfaces to fewer scratching opportunities. <br>
Probably no effect scratching, but I use Rodinal 1+49 or HC110 1+63, At those dilutions with sheet film they are more economical, sharper and you will not notice any impact on grain.</p>
<p>My times are taken from http://www.digitaltruth.com/devchart.php and sometimes shorten them about 10% when I am scanning the negative.</p>