i too grow in rockwool and i dont pre soak them any more as what is the point...i started off pre soaking and letting them dry off a tad but my mate who as been growing for years told me to stop and just get them out the packet and just dip them in your water and nute mix and off you go...his results was better than mine so i dont pre soak any more
that is basicly the instructions for using A-OK starter plugs. rinsing is more of an issue for bigger blocks.
You can also skip flushing if you run drain to waste setups, you just don't want a blocks worth of lime flowing back into your res.
I dip my starter cubes into a clonex soloution of 1 tbsp/quart and let excess run off.germ seed in a wet papertowel and stick the tail into starter cube facing down.Then its a waiting game.