If you are using Pro .. you have 5 ultrapeers. If you have Basic you have 3 you are connected to. Take one away & your LW 'will' most likely lose connection momentarily. How long that takes to find another U.P. LW can 'actually connect to' varies from person to person & from case to case scenario. I've had the odd person complain it took 'more than' several minutes to find another U.P.
ie: what works for you with immediate results does not necessarily work that well for others.
When it comes to connections, so many factors are behind it for each person's case such as isp, traffic on their isp, their set up, how many 'genuine' U.P's are available with free connection slots within fast access & other issues. Remembering there are all different types of U.P's out there including fake ones & spammer ones .. and poor behaving ones that should not really be UP's.
That's one reason LW made it more difficult to become a UP using the T3 setting. UP's are needed for people to connect to the gnutella network. It's been known for several years there are 'fake' / non-responsive ultrapeers out there.
It means some people will need to be patient (& careful) when applying these techniques to force themselves into ultrapeer mode.