My solution has been to load up a few transports and dump the ships directly on top of the spider nest clump. Immediately before (or while) doing this, move a number of FRD clean-up drones into the system (I usually set them to FRD rally at the edge of the system, so they teleport where needed and then teleport back to safety when not working). Ships kill turrets, clean up drones remove remains, easy peasy. If you want to get the maximum volume of ships back from the raid, it can be a good idea to bring an MRS to repair engines, but of course you may lose the MRS.