square-feeling: HuanYing, LiYing, ChiLong, Weilong.
I don't have the LiYing but it is the v2 of the HuanYing. The HuanYing is very, very squarey, perhaps even a bit too "stiff" but for your speed I'd say perhaps the Weilong is the better choice (I think you said your average was around 15 secs, right?).