I'm glad to see YPS aren't being changed. They were reviewed not that long ago and I for one think they are pretty fair (IMO obviously) across the sizes (I have played with anything from my Jack Russells through my pony size golden retriever (4" to 20+")).
So many things can impact the running time of a class (yardage "off", surface condition, weather, dog age, dog distract-ability, the list goes on and on and on). In respect to weavers in particular, I can say I've seen weavers dogs able to restart and still Q, they are rare but it does happen. That feels reasonable to me - and comes from someone with three dogs currently in Elite Weavers that might provide some examples from the small dog perspective...
Zak is 12.5 years old now (8" proficient, now 4" skilled vet). Used to be we could restart a set of weaves and he'd make up the time with speed and efficiency on the flat/tunnels. IF the surface wasn't too deep (he is SHORT legged) or wet (hates wet). As he aged we got closer and closer on time. This year he retired from weavers due to some neck concerns. Glad we played, glad we decided it wasn't for him while he was still having FUN in this particular class. Still loves playing limited runs in the other classes and limited weaves!
REO is 6.5 years old (12" proficient). He is steady (no major speed difference in/out of weaves) and efficient. He can make time if he's clean and confident. Surfaces and weather (other than rain, dislikes rain a LOT) impact him far less. His confidence however... So if we are "ON" we Q, if not (whether his confidence or

) we NQ. Seems fair that we need to bring our "A" game to Q.
Tommie is 4.5 years old (12" proficient) and is aka the "Pocket Rocket". IF I can keep her on course, she can Q even with a weave restart (sometimes 2 restarts if they are EARLY in the weaves). Obviously we are working on not needing those restarts but she is an example of small but can restart and still Q (but note her nickname and it is fitting).
1. All surfaces are different.
2. All dogs are different.
3. All dogs change over time.
4. Sometimes computer/keying errors due happen
It's a GAME. Have fun with your dog!
Laura B (MN)