HelpClient sided speed change

Alright, so I'm currently working on my multiboxer, and I've run into a problem. I need to have all of the account at the same speed.

So, I know going higher than the server sided speed says is bad, so does anyone know how I can set my speed to go lower?

Example: 5 Priests, one priest gets the lowest roll of them all (38 spd). How can I change the other 4 priests who all have 41 spd down to 38 speed?

Anyone have solution?

Also, how do I set this up with commands (/spd) possibly?

If you use a proxy you can change your speed stat on the update and newtick packets. Edit statdata 22

You can also change the client to have your speed stat set to a certain speed, but if the character(s) you are playing on do not have that speed the server will dc you, if not instantly, after a few minutes or so.