Why T-Wave and Toxic are not slashed as main moves?
Many of Slowbro's counters like Latias,Rotom-W,Jellicent and even Vaporeon,even though it is not so used,are fucked up by a Toxic on the switch in and Latios,Virizion and again Rotom-w are screwed by T-Wave.
These are just the biggest examples as there are plenty more.
You can always paralyze any fast poke that gives you problems or poison any stall machine.
Also Yawn deserves an OO mention since it is Slowbro's only way of phazing.
Finally why not merge the Defensive set with the CM set since they are essentially the same sets?
Just slash CM with the fire moves of choice or the psychic/ice move.