Ok, ok, I stand corrected lol. I didnt realize the scale we were using before would cause so many problems. This will be fixed in 0.5.
I have been tasked with finding ways to optimize sins itself. So far i have been sucessful in creating new lower poly, optimized Vanilla Sins planet meshes. FFS's they are only spheres. The problem was getting the cloud effects to work on these new meshes. Solution was in the tangents, and on the mesh itself. Every point, and edge MUST be welded. and DO NOT alter the duplicate tangent map in xsi. Just assign the tangents and leave it alone. There is some pole pinch with the new sphereically mapped optimized textures (all made using the original vanilla textures with ZERO detail loss), but TBH i can like with it. This is a game, Not the Sistine Chapel. Result is the new vanilla planets look exactly the same as the old ones except for the pole pinch, and some more texture cleanup i need to do, but use half the memory. Thats right HALF. I only have the terran, desert, ice, gas giant, and volcanic planets done so far. Asteroids and such may need more time, and much more work. The Skybox itself will get the same optimization process as the planets.. Perhaps some new skybox textures 
Planet before optimization (original sins unaltered) 2200 tri's. 2048x2048 texture with 1024x1024 pixels of wasted space. Memory Hogger

Planet AFTER optimization 1800 tri's. 2048x1024 spherically mapped texture made from original sins texture. Uses HALF the ram of the above. Yes texture is a little missaligned that will be fixed later.

This is not a "perfect solution", and the computer "elitist" may want to keep thier original memory hoggers, However this along with other optimizations i am doing will help prevent sins from hitting its 2 gig ram brick wall.
Once i am done with this i will upload the Optimized Planet Mod for all users. Other mods will be welcome to use it like Distant Stars. The only planet mesh i didnt touch was the gas giant, because there was nothing wrong with the original mesh. Its texture however was optimized, and uses half the ram.