IWT will still flake out depending on certain things. Casting a spell while running is a good way to see it bug out. Doing anything that increases movement speed is another. So I will often see my melee toons keep on running if my ret judges or my enhance casts a 5*MW LB while running up on a target.

It's not something that is ever going to be totally eliminated. All you can do is reduce the frequency of it. Don't spam IWT. I only send it when I need to. Keep the distance that the slaves need to run to a minimum. I do this by having my pull key also send a follow command to my melee slaves. Reduce your spam speed in general. Keep a movement or follow button handy, mine is one of the thumb buttons on my mouse.

I would not advise using Jamba's follow strobing for combat. It is useful in some situations, but for a melee team, you are most likely going to massively gimp your DPS as the slaves keep turning away from the mob to face your main. Follow strobing is great for traveling, not for combat. Straight up "Follow after combat" is the better option.