Hi, good to see the Lith Print Exchangers working so hard!
Craig, Varycon is rather slow, especially in Lith; I have experienced that as well. It is surely a good idea to loose the grade filter, it won't be needed and will make exposure much faster. As for development, I have found that Varycon really needs very dilute developer to show some color (if you want that) - which means even longer development times, developer dying sooner etc. Just the other night I had to replenish during development.. At that time, the print had been in the developer for over half an hour. After replenishment, it still took almost 15 minutes until snatch point.
The only solution for this: using the developer hot (around 30-40°C). All of a sudden, times even for very dilute developer are 3-7 minutes. It dies even faster because it is hot, but at least you dont have to sit around in the dark for half an hour before thinking "mmmh... is the developer dying?"
Regarding the details/graininess of the Varycon, Jerevan is correct, it is mainly a function of the paper. But I have found Varycon to be able to almost match the details in Fomatone. Moreover, grain size is also related to the exposure/development. Dark tones make the grain look much bigger. How this can be connected to development control (via more/less dilution and thus development time) I dont know. But there are experts around on APUG... Mr. Rudman, maybe?
regards, Chris