I understand that rubber is somewhat arbitrary depending on speed and connection quality, so I make sure to test out every one to see if it "feels" low. If your server is not on this list* then your server is not low rubber.
- Agility's Arena »FFA« || Rubber: 2 -- Speed: Medium -- Trails: Long
This is as close to perfect as you can get in the non-existent low-rubber scene. Clearly a lot of care when into the settings. Yes you can jam into the walls carelessly, but it's very hard to beat out another person's grind and you're not likely to beat out two or three of them in a row. A stable server brings this up to 5/5 stars.
Maho's Tron || Rubber: 1 -- Speed: Medium -- Trails: Infinite
Default settings, hosted in France I think. Kind of unstable. Nothing noteworthy, but should be included in the list because I think it's nice to have the default settings hosted somewhere at any given time. 2/5 stars.
Moe's Tavern II || Rubber: 1 -- Speed: Medium -- Trails: Short
Default settings but with a larger grid and trails that a much too short. Could be interesting for new players, but anyone who can play Fort/Sumo would be bored instantly. 1/5 stars.
Nexus9 Deathmatch || Rubber: .2 -- Speed: High -- Trails: Infinite
Ah yes, Nexus9. Now considered a classic, we can still see games played here on rare occasion. I really think setting up a low-rubber tournament here would be interesting. In fact, I remember discussing that with N9 regulars three years ago. Maybe it's up to me to make it happen? 4/5 stars.
PixelParty.de || Rubber: 3 -- Speed: High -- Trails: Infinite
This almost looks and feels like a N9 clone. The rubber is more forgiving, which is good because the server is a little unstable, and the cycle delay is shorter with no double-bind restriction. This server is probably what you would get if I remixed N9, haha. 4/5 stars.
And that's all there is, sadly. Two servers that should be on there are the currently missing Shrunkland and Bebop in Harlem. I hope to see them up soon. There was also one server that almost made the cut, named Weapon1. Rubber was set at 4 and the cycle accel was crazy. Unfortunately the base speed made the rubber too effective to be considered low rubber, which is fine since the server was highly unstable anyway. You would need that much rubber just to deal with the lag.
*All AoT servers are all designed to be low rubber unless they are copies of other games.