I racked 2 batches on skins last weekend and did not have great success. I have a 2.5" diameter SS tube in which I drilled numerous 1/8" holes, more near the bottom, not so many up top. I wrapped it in a mesh straining bag cut to fit. It worked great until about 2 inches below the level in the picture (both batches). At that point the flow into the tube could not keep up with the siphon and I lost suction. I ended up dumping the remainder through another straining bag. I was happy that the wine inside the tube was clean and free of debris, but it was still a messy job getting all the good wine out of the fermenter. It was better than my last attempt without the tube, but I think I need to find a way to remove a significant portion of the skins prior to racking or drill another 100 or so holes near the bottom of the tube.
On the bright side I reused the leftover skins (Zin & Cab Sauv) and juice to start a new experimental batch (along with a couple LBs of raspberries, Welches, etc.) and the BM4x4 was happy to take off again. Should be making another racking attempt this weekend. I hope the recent experience makes this racking a bit more successful.