Yeah, don't stress about passing and congestion for solo riders. Here's a couple of tips though...
Unless its the first lap, we've ridden this section of trail... quite a few times... quite recently.
If we say "keep going", then please keep going. We know this section isn't suitable for passing and there's a better opportunity just up ahead.
If we say "can I have track here?", then please allow us to pass here. We know this section is suitable for passing and it gets worse just up ahead.
When we ask for track, please don't look for a section wide enough to come to a complete stop and put your foot down. All we need is for you to slow down slightly, move slightly off the main line and tell us to go. We're quite capable of riding around you as long as we're confident you're expecting us.
If you're unsure why we just caught up to you and haven't said anything, we're probably happy for the rest and we know this section isn't suitable for passing. Ask us if we want to go past before you jump out of the way.
Relax and enjoy the ride, we're out there to have fun too.