First thing is to murder Itsahorse because right at the start it will charge forward and start kicking your Insectors. As you already know you should be very careful against Pseudo Staggy. As long as you limit it's throw ability your Insectors will be safe from getting out of the board. Susanoo Beetle's Crushing Horn can really hurt when it connects. So this is the one among those that you need to defeat as fast as possible. The remaining should be less threatening than the three Insectors already mentioned.