If the warp in is 50 km from the spawn, your going to waste a lot of time traveling. During that same time your taking damage, your not set-up to be an uber tank, and this can lead to some harry situations as you travel through the rat optimals to get to them. Different spawn locations for each wave can also be an issue. First your wasting time traveling between the spawns, your also providing time for the rats to move around so they are not going to be at the same spot but will try to stay at their optimals to you, forcing you to chase them down or use drones to kill them, which is something you only want to do as a last resort.
Finally you don't want more than two battleships spawning in any specific wave. While working with someone else this isn't an issue as the other person is blapping the battleships with guns, but when your main weapon is smartbombs, killing a battleship before they get out of smartbombing range can be problematic. With just one battleship in the spawn it is less of an issue as you can potentially follow them a bit without wandering off the spawn. With more than one battleship it becomes more difficult, which makes that web on the smartbombing battleship important as it allows you to control hostile bs speeds, providing you more time for your smartbombs to apply damage. Smartbombs themselves don't do a lot of dps, but they do it to a lot of hostiles at the same time, so keeping the rats within range of your smartbombs is key to ratting with them.
The other option is Sansha Rally Point (notice the small title difference). While very similar to Sansha's Rally Point, Sansha Rally Points have a few quirks. The biggest one is the respawn is roughly 20 km away from the warp in. This can slow your attempts to clear the site down as you need to travel to the spawn. It also has a slightly heavier initial spawn (Sansha's Rally Point is all frigates while Sansha Rally Points have a mix of cruisers and frigates). If your lucky you can afterburn to the 'clump fast enough and get at least the frigs with your smartbombs. However if they aggress and move to their optimals quick enough, you'll likely find it easier to kill them with drones and focus on deploying on the spawn to use smarties for the next wave. Once your on top of the spawn and the initial wave has been killed the remaining waves will play out the same with either a single or duel bs spawn in the final wave.
|Initial Sansha's Rally Point Spawn|
|Final Dual BS Rally Point Wave|
|Inital Sansha Rally Point Spawn, note this spawn is near the right tower.|
|Had to use drones to finish the last part of the initial wave.|
|Final Sansha Rally Point Wave|