×First off, know that the wubbas will move before *any* of the roaches that are spawned. That means that they're an almost guaranteed shield while you're moving. So: don't worry over much about roaches at your back, because you can shield that with wubbas. There's only 12 roaches spawning every time, and half of them are going to get stuck with wubbas anyways.

×Wubbas won't move at all if they want to move diagonally towards you but can't. This includes when other monsters - or even other Wubbas - are in the way. So that means that when you're moving in a straight line, the wubbas will likely end up in a long line behind you. So: move according to how you want the wubbas to bunch up! If you move horizontally or vertically, they'll start forming a line behind you. If you move diagonally, they'll form clumps.