Well, I'm jealous of the crane. I've not seen anyone with a pattern or drawing for one that fits the Charleston Spar roller furling main on the 310. Without a crane, the spinnaker halyard to too close to the Genoa fuller. I've tried to set the chute with the Genoa out and drawing. However, trying to furl the Genoa results in it fouling the chute or chute hazard. So, the process is furl the Genoa, raise the chute, raise the sock. It is slow, but it keeps the lines clear.
I tack the symmetric to the bail on the anchor roller. It must be gybed on the outside as there is insufficient room between the furled genoa and the asymmetric. I've not yet trapped the lazy sheet under the boat, but I'm sure it will happen one day - at a most inopportune time.
I don't fly it in winds above 12 knots. One must know their limitations. Above that, the 155 Genoa provides sufficient speed for me.
In rather light air one evening I polled out the Genoa to windward, and flew the asymmetric on the lee. It was the last leg on an August Wednesday night. It appeared as if the Genoa scooped up sufficient air forward of the mast, keeping the symmetric inflated. Otherwise, at 170 degrees apparent, the main would have blanked the chute. Given all the lines, etc, there was no way we were going to be able to round a mark. We took some time to get it all down.
My crowning achievement on Wednesday evening races was when a symmetrical spinnaker boat, that had considerable speed on us, tried to pass us upwind. With the asymmetric we took them up until their chute collapsed. They then dropped back and went below us trying to pass. We eased down to keep them in our lee to prevent them passing. I have a video, but it is too large to upload.