Turning up Stall and Circle %

What discretion does:

- at less than 33, the wrestler will rarely if ever stop to catch his breath. Using the front facelock -> elbow causes the wrestler to drop his opponent right where he's already standing. It can generally be seen as a level where the wrestler disregards their own limits to focus entirely on attacking the opponent.  As such, it's probably best saved for wrestlers who barely do actual wrestling - your Mister Pogos, your modern Takashi Iizukas, etc.
- from 33 to 67 or so, the wrestler will become increasingly likely to catch their breath. Using the front facelock will cause the wrestler to move towards a corner. The vast majority of NJPW wrestlers are in a range of about 35 - 60, presumably to reflect how late into a match they will stop and sell the impact of the match on their bodies. They will be somewhat likely to use the tree of woe hanging position in a corner.
- above 67, wrestlers will drop their opponents into the center of the ring and catch their breath more frequently. At high discretion, wrestlers will also opt never to set their opponents up into the tree of woe.

Generally speaking, you'll want to set discretion lower - but not below 35 - if you're making someone who works a harder-hitting style with few pauses, and higher for a more methodical pace.  Essentially, deciding on how much you want to nuke breathing and/or make it so that they only stop the action once or twice a match.   I'd say anything above 70 is an edge case, because you're losing out on the tree of woe as an option; but that's just me.