Normally a good process for ultrapeer selection includes as a paramater the number of files a user is sharing or the average number of uploads. I know Bearshare is doing that, but I nerver heard about it for Limewire (Trap_jaw???). If you are a big sharer, disable the ultrapeer option in preferences.

Oh and an 2.9.x ultrapeer has a hard limit of 8Kb/s of message routing, so even 2.9.10 with 32 connections should route the same amount of message as 16 connections for 2.9.8.