Slotting question

I noticed Vienradzis's thread about improving Snake Skull slotting chances, and was just wondering wether I'm doing it right or wether I could use some of them Jellyfishes.
Thoughts?
Edit: Oh and this is also in case Jorb/loftar listen to agentlemanloser's suggestion to add trees that fight back, I am prepared!
Thoughts?
Edit: Oh and this is also in case Jorb/loftar listen to agentlemanloser's suggestion to add trees that fight back, I am prepared!