Warrior/Knight Help How To Make Meta Rainbow Tank Work?

So I'm using stardust/gravity/gemini/fermion and a big problem Im having rn is not having enough SP.

I have a prism with 16sp, Ik I need another one, but should I use Prowess and Morph ruby for the other two slots? Would that be enough to allow me to wear gemini and gravity? Or should I use something else.. thanks, and pls tell me the minimum amount of sp I need on the stardust/prisms/ruby

 

You need 290 SP total
-198 for level 100
You need 92 skill points total
92-25=67 for Prowess
67-16=51 for Prism you have
You need 51 more skill points
So with a 35 SP Stardust (about average, aim for higher) you would need an average Prism and Ruby