I've tried many different methods and have come to like the counterclockwise tension method using top of keyway tension. When you pick counterclockwise, the sidebar tends to dig into the pins that are not rotationally set. Use heavy tension and push up on the pins. Pins that are really hard to lift up are rotationally not set. What you do is reduce the tension and use your hook to go to the back of the pin and pull forwards on the side. If you want to set the pin left, pull for the back right hand side. For a right pin, pull from the left.
What should happen is you will here a snap and the pin will become easy to lift when you rotationally set it. Then search for the next pin that is hard to lift and repeat. Once you have all the pins rotationally set, pick to shear and the lock should open.
As for picks, the two picks that worked best for me on my medecos after tons of experimentation were a half ball pick from southord (For shearline picking) and a euro slimline pick from lockpicktools.com (For pin rotation)
As for using a medecoder, its a great concept but is not needed to open the locks. I personally find it really hard to grab a pin with a small wire and rotate it and gave up with the groovegrabber/medecoder idea farely quickly. Sticking to a hook seemed to work better for me. The hook technique also works on the new medeco's with milled pins which the medecoder is ineffective against.
Here is an image of the tools I used to pick my medecos so you can see what type of hook seems to work best. I found something slimmer and springy to work much better than the rigid hooks you normally use.
I generally like to clockwise tension things but I figure I can rotationally set them, reverse tension and continue picking so it should work okay 
