You almost always want 4 VS Seeker, that's not really an option to drop. I'd be more likely to drop 1 Skyla or 1 Lysandre.
But if you are dropping 2/2 Octillary and Foreset, that's 5 slots open. You could put in 2 Wob, 2 Labs, and then 2 Revitalizers if you also drop one of the Skyla or...