What's so special about 798 and 1182?

I've been working on A219357 for nine days now. I'm especially proud of my graph, where the two wayward points (798, 2164818573) and (1182, 5394998141) are easily picked out.

A long run

Continuing with Eric Angelini's digit-difference/add-subtract/iterate procedure, I have now come across a particularly long run that does not repeat a previous element (i.e., confirm that a loop has been entered) until step 175128. The starting number (linking to a 32 MB evolution) is 293613.

Update (8 Nov 2012): An even longer run that does not repeat a previous element until step 337550: The starting number (linking to a 55 MB evolution) is 294066. I've made a graph of the run.